fix: 添加异常处理以增强知识库获取的稳定性

src/plugins/heartFC_chat/heartflow_prompt_builder.py

@@ -535,6 +535,7 @@ class PromptBuilder:
 
         logger.debug(f"获取知识库内容，元消息：{message[:30]}...，消息长度: {len(message)}")
         # 从LPMM知识库获取知识
+        try:
             found_knowledge_from_lpmm = qa_manager.get_knowledge(message)
 
             end_time = time.time()
@@ -552,6 +553,16 @@ class PromptBuilder:
                 related_info += knowledge_from_old
                 logger.debug(f"获取知识库内容，相关信息：{related_info[:100]}...，信息长度: {len(related_info)}")
                 return related_info
+        except Exception as e:
+            logger.error(f"获取知识库内容时发生异常: {str(e)}")
+            try:
+                knowledge_from_old = await self.get_prompt_info_old(message, threshold=0.38)
+                related_info += knowledge_from_old
+                logger.debug(f"异常后使用旧版数据库获取知识，相关信息：{related_info[:100]}...，信息长度: {len(related_info)}")
+                return related_info
+            except Exception as e2:
+                logger.error(f"使用旧版数据库获取知识时也发生异常: {str(e2)}")
+                return ""
 
     @staticmethod
     def get_info_from_db(