Added a check to ensure the input text is a string before proceeding with parsing (#22809)

Co-authored-by: -LAN- <laipz8200@outlook.com>

api/core/llm_generator/llm_generator.py

@@ -114,7 +114,8 @@ class LLMGenerator:
                 ),
             )
 
-            questions = output_parser.parse(cast(str, response.message.content))
+            text_content = response.message.get_text_content()
+            questions = output_parser.parse(text_content) if text_content else []
         except InvokeError:
             questions = []
         except Exception:

api/core/llm_generator/output_parser/suggested_questions_after_answer.py

@@ -15,5 +15,4 @@ class SuggestedQuestionsAfterAnswerOutputParser:
             json_obj = json.loads(action_match.group(0).strip())
         else:
             json_obj = []
-
         return json_obj