Ramiro Morales 04d9730b12 Fixed #13085 -- Don't fail on creation of model with GFK to a model with __len__() returning zero. ...

Also, according to the comments on the ticket and its duplicates, added
tests execising saving an instance of a model with a GFK to:

* An unsaved object -- This actually doesn't generate the same failure
  but another ORM-level exception. The test verifies it's the case.

* An instance of a model with a __nonzero__() method thant returns False
  for it. This doesn't fail because that code path isn't executed.

* An instance of a model with a CharField PK and an empty value for it.
  This doesn't fail.

2013-02-07 16:05:54 -03:00

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