Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

api/core/app/apps/advanced_chat/app_generator.py

@@ -523,7 +523,8 @@ class AdvancedChatAppGenerator(MessageBasedAppGenerator):
         with Session(bind=db.engine, expire_on_commit=False) as session:
             workflow = _refresh_model(session=session, model=workflow)
             message = _refresh_model(session=session, model=message)
-        assert message is not None
+        if message is None:
+            raise RuntimeError("Failed to refresh Message; _refresh_model returned None.")
         #     workflow_ = session.get(Workflow, workflow.id)
         #     assert workflow_ is not None
         #     workflow = workflow_

api/core/app/apps/chat/app_generator.py

@@ -166,8 +166,8 @@ class ChatAppGenerator(MessageBasedAppGenerator):
 
         # init generate records
         (conversation, message) = self._init_generate_records(application_generate_entity, conversation)
-        assert conversation is not None
-        assert message is not None
+        if conversation is None or message is None:
+            raise RuntimeError("_init_generate_records() returned None for conversation or message")
         generated_conversation_id = str(conversation.id)
         generated_message_id = str(message.id)
 

api/core/app/apps/completion/app_generator.py

@@ -149,8 +149,11 @@ class CompletionAppGenerator(MessageBasedAppGenerator):
 
         # init generate records
         (conversation, message) = self._init_generate_records(application_generate_entity)
-        assert conversation is not None
-        assert message is not None
+        if conversation is None or message is None:
+            raise RuntimeError(
+                "_init_generate_records() returned None for conversation or message, "
+                "which is required to proceed with generation."
+            )
 
         # init queue manager
         queue_manager = MessageBasedAppQueueManager(