Add comment refering to ticket. Refs #671, #672

Author: omab

social/pipeline/user.py

@@ -84,6 +84,7 @@ def user_details(strategy, details, user=None, *args, **kwargs):
         # on fields defined in SOCIAL_AUTH_PROTECTED_FIELDS.
         for name, value in details.items():
             if value and hasattr(user, name):
+                # Check https://github.com/omab/python-social-auth/issues/671
                 current_value = getattr(user, name, None)
                 if not current_value or name not in protected:
                     changed |= current_value != value