handle ID key in changes dictionary (#4265)

api/stages_api_test.py

@@ -572,6 +572,7 @@ class StagesAPITest(testing_config.CustomTestCase):
     """
     testing_config.sign_in('feature_owner@example.com', 123)
     json = {
+      'id': 10,
       'desktop_first': {
         'form_field_name': 'ot_milestone_desktop_start',
         'value': 200,
@@ -595,6 +596,7 @@ class StagesAPITest(testing_config.CustomTestCase):
     """Raises 400 if OT end milestone is updated during OT creation process."""
     testing_config.sign_in('feature_owner@example.com', 123)
     json = {
+      'id': 10,
       'desktop_last': {
         'form_field_name': 'ot_milestone_desktop_end',
         'value': 206,

framework/basehandlers.py

@@ -362,8 +362,9 @@ class EntitiesAPIHandler(APIHandler):
     ot_action_requested = False
 
     mutating_ot_milestones = any(
+        isinstance(v, dict) and (
         v['form_field_name'] == 'ot_milestone_desktop_start' or
-        v['form_field_name'] == 'ot_milestone_desktop_end'
+        v['form_field_name'] == 'ot_milestone_desktop_end')
         for v in change_info.values())
     ot_creation_in_progress =  (
         stage.ot_setup_status == OT_READY_FOR_CREATION or