MockSet.annotate function handle case when row._annotated_fields is None#175

stefan6419846 merged 5 commits intostphivos:masterstphivos/django-mock-queries:masterfrom

DvirHaberman:bugfix-row-_annotated_fields-can-be-NoneDvirHaberman/django-mock-queries:bugfix-row-_annotated_fields-can-be-NoneCopy head branch name to clipboard