fix: throw exception if field is None on scope_mappings

Author: rpenido

xblock/field_data.py

@@ -5,7 +5,6 @@
 simple.
 """
 import copy
-
 from abc import ABCMeta, abstractmethod
 from collections import defaultdict
 
@@ -148,7 +147,12 @@ def _field_data(self, block, name):
         if scope not in self._scope_mappings:
             raise InvalidScopeError(scope)
 
-        return self._scope_mappings[scope]
+        scope_mapping = self._scope_mappings[scope]
+
+        if scope_mapping is None:
+            raise InvalidScopeError(scope)
+
+        return scope_mapping
 
     def get(self, block, name):
         return self._field_data(block, name).get(block, name)
@@ -161,8 +165,10 @@ def set_many(self, block, update_dict):
         for key, value in update_dict.items():
             update_dicts[self._field_data(block, key)][key] = value
         for field_data, new_update_dict in update_dicts.items():
-            if field_data is not None:  # Ignore fields from scopes that are not loaded
+            try:
                 field_data.set_many(block, new_update_dict)
+            except InvalidScopeError:
+                pass  # Ignore fields that are not in the scope_mappings
 
     def delete(self, block, name):
         self._field_data(block, name).delete(block, name)