Fixed #33107 -- Fixed import_string() crash on not fully initialized modules.
Fixed #33107 -- Fixed import_string() crash on not fully initialized modules.

Regression in ecf87ad513fd8af6e4a6093ed918723a7d88d5ca.

Thanks Collin Anderson for the report.
blighj/django,pauloxnet/django,rsalmaso/django,felixxm/django,solarissmoke/django,MarkusH/django,apollo13/django,blighj/django,monetate/django,auvipy/django,MarkusH/django,auvipy/django,felixxm/django,pauloxnet/django,takis/django,blighj/django,monetate/django,auvipy/django,solarissmoke/django,django/django,ghickman/django,apollo13/django,auvipy/django,dsanders11/django,rsalmaso/django,manhhomienbienthuy/django,MarkusH/django,rsalmaso/django,takis/django,takis/django,dsanders11/django,felixxm/django,blighj/django,felixxm/django,ghickman/django,dsanders11/django,solarissmoke/django,apollo13/django,ghickman/django,pauloxnet/django,manhhomienbienthuy/django,pauloxnet/django,shaib/django,django/django,manhhomienbienthuy/django,django/django,monetate/django,shaib/django,apollo13/django,ghickman/django,MarkusH/django,shaib/django,manhhomienbienthuy/django,monetate/django,takis/django,django/django,dsanders11/django,solarissmoke/django,shaib/django,rsalmaso/django