add nullable user to invocation error events

invokeai/app/services/events/events_base.py

@@ -122,6 +122,7 @@ class EventServiceBase:
         source_node_id: str,
         error_type: str,
         error: str,
+        user_id: str | None,
     ) -> None:
         """Emitted when an invocation has completed"""
         self.__emit_queue_event(
@@ -135,6 +136,7 @@ class EventServiceBase:
                 "source_node_id": source_node_id,
                 "error_type": error_type,
                 "error": error,
+                "user_id": user_id
             },
         )
 

invokeai/app/services/session_processor/session_processor_default.py

@@ -237,6 +237,7 @@ class DefaultSessionProcessor(SessionProcessorBase):
                                 source_node_id=source_invocation_id,
                                 error_type=e.__class__.__name__,
                                 error=error,
+                                user_id=None
                             )
                             pass