Checking instance._state.adding in instance_pre_save
#214
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…king not instance.pk is insufficient. It can have a PK but not be saved in the DB yet, which will call this to fail.
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Added a check for
instance._state.addingtoinstance_pre_saveas checkingnot instance.pkis insufficient. In cases involving concrete model inheritance it can have a PK set but not be saved in the DB yet, which will call this to fail.