Avoid exception in `AutoPrefetchMixin` when including a reverse one to one relation#536

sliverc merged 5 commits intodjango-json-api:masterdjango-json-api/django-rest-framework-json-api:masterfrom

InvGate:feature/fix_autoprefetch_mixinInvGate/django-rest-framework-json-api:feature/fix_autoprefetch_mixinCopy head branch name to clipboard