title: Choices prevent from making migrations
body: <p><strong>Django 3.0.4</strong></p>
  
  <pre><code>    def get_choices():
          blank_choice = (None, '----')
          choices = []
          # choices = [blank_choice] + [(str(item.id), str(item)) for item in YandexTextAdTemplates.objects.all()]
          return choices
  
  
      class CopyForm(forms.Form):
          ad_template = forms.ChoiceField(choices=get_choices())
  </code></pre>
  
  <p>I need choices in my form. Now the necessary string is commented out. If I return choices back, it will work. But it will not make migrations. </p>
  
  <pre><code>(venv) michael@michael:~/PycharmProjects/ads3/ads_manager$ python manage.py makemigrations
  Traceback (most recent call last):
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
      return self.cursor.execute(sql, params)
  psycopg2.errors.UndefinedTable: relation "yandex_ads_yandextextadtemplates" does not exist
  LINE 1: ...ndextextadtemplates"."audience_yandex_pixel" FROM "yandex_ad...
                                                               ^
  
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "manage.py", line 21, in &lt;module&gt;
      main()
    File "manage.py", line 17, in main
      execute_from_command_line(sys.argv)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
      utility.execute()
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/base.py", line 328, in run_from_argv
      self.execute(*args, **cmd_options)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/base.py", line 366, in execute
      self.check()
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/base.py", line 392, in check
      all_issues = self._run_checks(
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/management/base.py", line 382, in _run_checks
      return checks.run_checks(**kwargs)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/checks/registry.py", line 72, in run_checks
      new_errors = check(app_configs=app_configs)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/checks/urls.py", line 13, in check_url_config
      return check_resolver(resolver)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/core/checks/urls.py", line 23, in check_resolver
      return check_method()
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/urls/resolvers.py", line 407, in check
      for pattern in self.url_patterns:
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
      res = instance.__dict__[self.name] = self.func(instance)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/urls/resolvers.py", line 588, in url_patterns
      patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/utils/functional.py", line 48, in __get__
      res = instance.__dict__[self.name] = self.func(instance)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/urls/resolvers.py", line 581, in urlconf_module
      return import_module(self.urlconf_name)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/importlib/__init__.py", line 127, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 1014, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 991, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 975, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 671, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 783, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/home/michael/PycharmProjects/ads3/ads_manager/ads_manager/urls.py", line 35, in &lt;module&gt;
      path('yandex_ads/', include("yandex_ads.urls", namespace="yandex_ads"), name="yandex_ads"),
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/urls/conf.py", line 34, in include
      urlconf_module = import_module(urlconf_module)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/importlib/__init__.py", line 127, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 1014, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 991, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 975, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 671, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 783, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/home/michael/PycharmProjects/ads3/ads_manager/yandex_ads/urls.py", line 3, in &lt;module&gt;
      from .views import RequestYandexAds, ShowYandexAds, CreateYandexAds, CopyAdTemplate
    File "/home/michael/PycharmProjects/ads3/ads_manager/yandex_ads/views.py", line 6, in &lt;module&gt;
      from .forms import CopyForm
    File "/home/michael/PycharmProjects/ads3/ads_manager/yandex_ads/forms.py", line 12, in &lt;module&gt;
      class CopyForm(forms.Form):
    File "/home/michael/PycharmProjects/ads3/ads_manager/yandex_ads/forms.py", line 13, in CopyForm
      ad_template = forms.ChoiceField(choices=get_choices())
    File "/home/michael/PycharmProjects/ads3/ads_manager/yandex_ads/forms.py", line 8, in get_choices
      choices = [blank_choice] + [(str(item.id), str(item)) for item in YandexTextAdTemplates.objects.all()]
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/models/query.py", line 276, in __iter__
      self._fetch_all()
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/models/query.py", line 1261, in _fetch_all
      self._result_cache = list(self._iterable_class(self))
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/models/query.py", line 57, in __iter__
      results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1151, in execute_sql
      cursor.execute(sql, params)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 100, in execute
      return super().execute(sql, params)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 68, in execute
      return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
      return executor(sql, params, many, context)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
      return self.cursor.execute(sql, params)
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
      raise dj_exc_value.with_traceback(traceback) from exc_value
    File "/home/michael/PycharmProjects/ads3/venv/lib/python3.8/site-packages/django/db/backends/utils.py", line 86, in _execute
      return self.cursor.execute(sql, params)
  django.db.utils.ProgrammingError: relation "yandex_ads_yandextextadtemplates" does not exist
  LINE 1: ...ndextextadtemplates"."audience_yandex_pixel" FROM "yandex_ad...
  </code></pre>
  
  <p>So, I commented the line out, organized empty list for choices. Migrations have been made.</p>
  
  <p>But it I need the correct functionality and possibility to make migrations. Could you help me here?</p>