When i'm trying to do simple get() it raises error:

Traceback (most recent call last):
  File "/base/python_lib/versions/1/google/appengine/ext/webapp/
__init__.py", line 501, in __call__
    handler.get(*groups)
  File "/base/data/home/apps/musicvideobuger/1.332849534198860778/
video_crawler.py", line 233, in get
    videos = Video.all().fetch(100)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 1391, in fetch
    return map(self._model_class.from_entity, raw)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 997, in from_entity
    instance = cls(None, _from_entity=True, **entity_values)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 596, in __init__
    prop.__set__(self, value)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 2581, in __set__
    value = self.validate(value)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 2611, in validate
    if value is not None and not value.has_key():
AttributeError: 'unicode' object has no attribute 'has_key'

It happened after i changed some of properties in model, and i can't
make migration.
Also why get() function checking required option of property? I had
some old data with None values in properties, witch in new version had
been checked as required. When i'm trying to access objects with such
properties with Null values i get error that this property required,
by i'm just trying to get, not put!

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