def __init__(self, length=None, **kwargs):
        super(VARCHAR, self).__init__(length=length, **kwargs)
Uploading an empty file is not valid.
dataset/ETHPy150Open zzzeek/sqlalchemy/lib/sqlalchemy/dialects/mysql/types.py/VARCHAR.__init__--crossover with--dataset/ETHPy150Open caktus/django-sticky-uploads/stickyuploads/tests/test_views.py/UploadViewTestCase.test_empty_file