title: "The view polls.views.index didn't return an HttpResponse object. It returned None instead." Error in Django
body: <p>I am following the tutorial in Django documentation. I did exactly as it has said in the <a href="https://docs.djangoproject.com/en/1.10/intro/tutorial01/" rel="nofollow">tutorial</a>.</p>
  
  <p>ValueError at /polls/</p>
  
  <p>When I load on browser "<a href="http://localhost:8000/polls/" rel="nofollow">http://localhost:8000/polls/</a>" I get this error:</p>
  
  <pre><code>The view polls.views.index didn't return an HttpResponse object. It returned None instead.
  
  Request Method:     GET
  Request URL:    http://localhost:8000/polls/
  Django Version:     1.10.1
  Exception Type:     ValueError
  Exception Value:    
  
  The view polls.views.index didn't return an HttpResponse object. It returned None instead.
  
  Exception Location:     /home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/django/core/handlers/base.py in _get_response, line 198
  Python Executable:  /home/jack/anaconda2/envs/py3k/bin/python
  Python Version:     3.4.5
  Python Path:    
  
  ['/home/jack/Documents/Django Learning/mysite',
   '/home/jack/anaconda2/envs/py3k/lib/python34.zip',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4/plat-linux',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4/lib-dynload',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/Sphinx-1.4.1-py3.4.egg',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages/setuptools-23.0.0-py3.4.egg',
   '/home/jack/anaconda2/envs/py3k/lib/python3.4/site-packages']
  
  Server time:    Thu, 6 Oct 2016 10:32:20 +0000
  </code></pre>
  
  <p>Code Of mysite/polls/views.py</p>
  
  <pre><code>from django.shortcuts import render
  from django.http import HttpResponse
  
  def index(request):
      HttpResponse("Welcome to poll's index!")
  # Create your views here.
  </code></pre>