Refactor rest_api app and the method end points are registered. All apps API URL endpoints are now registered under the 'rest_api' namespace.

Update DRF and DRF swagger versions. Update all apps API registration method.

mayan/apps/documents/tasks.py

@@ -181,7 +181,7 @@ def task_upload_new_version(self, document_id, shared_uploaded_file_id, user_id,
 
     with shared_file.open() as file_object:
         document_version = DocumentVersion(
-            document=document, comment=comment, file=file_object
+            document=document, comment=comment or '', file=file_object
         )
         try:
             document_version.save(_user=user)