Modified [7760] to not include a "col is not NULL" fragment for non-nullable fields.
Modified [7760] to not include a "col is not NULL" fragment for non-nullable fields.

This avoids any use of "pk is not NULL" fragment, which behave inconsistently
in MySQL. Thanks to Russell Keith-Magee for diagnosing the problem and
suggesting the easy fix.

Refs #7076.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@7812 bcc190cf-cafb-0310-a4f2-bffc1f526a37

aparo/django-nonrel,aparo/django-nonrel,FlaPer87/django-nonrel,FlaPer87/django-nonrel,FlaPer87/django-nonrel,aparo/django-nonrel