Missed in f7a363ee.

Thanks IRC alias rpkilby for the report.

Thanks Simon Charette for review.

Thanks Claude Paroz and Tim Graham for reviews, and
Mjumbe Wawatu Poe for the initial regression test.

Thanks to Mariusz Felisiak and Tim Graham for review.

Thanks Tim Graham for the review.

Thanks Jarek Glowacki for the report.

DateTimeField inherits these lookups from DateField.

Thanks Federico Capoano for finishing the patch.

Fixed #27436 -- Fixed makemigrations crash when creating migrations on a separate drive than where Django is installed.

If the test user creation fails here, _create_test_db() would return without
switching to the test user which caused the tests to run using the main
connection instead of the test user.