feature(fix?): 在发送消息之前统一检查消息内容是否为空, 不允许发送空消息, 以解决该消息内容不支持查看以及gemini返回<empty content>问题

astrbot/core/pipeline/respond/stage.py

@@ -72,6 +72,20 @@ class RespondStage(Stage):
             # random
             return random.uniform(self.interval[0], self.interval[1])
 
+    async def _is_empty_message_chain(self, chain):
+        """检查消息链是否为空
+
+        Args:
+            chain (MessageChain): 消息链
+        """
+        for comp in chain:
+            if isinstance(comp, Plain):
+                if comp.text.strip():
+                    return False
+            else:
+                return True
+        return True
+
     async def process(
         self, event: AstrMessageEvent
     ) -> Union[None, AsyncGenerator[None, None]]:
@@ -82,6 +96,13 @@ class RespondStage(Stage):
         if len(result.chain) > 0:
             await event._pre_send()
 
+            # 检查消息链是否为空
+            if await self._is_empty_message_chain(result.chain):
+                logger.info("消息为空，跳过发送阶段")
+                event.clear_result()
+                event.stop_event()
+                return
+
             if self.enable_seg and (
                 (self.only_llm_result and result.is_llm_result())
                 or not self.only_llm_result

astrbot/core/provider/sources/gemini_source.py

@@ -127,7 +127,7 @@ class ProviderGoogleGenAI(Provider):
             if message["role"] == "user":
                 if isinstance(message["content"], str):
                     if not message["content"]:
-                        message["content"] = "<empty_content>"
+                        message["content"] = ""
 
                     google_genai_conversation.append(
                         {"role": "user", "parts": [{"text": message["content"]}]}
@@ -138,7 +138,7 @@ class ProviderGoogleGenAI(Provider):
                     for part in message["content"]:
                         if part["type"] == "text":
                             if not part["text"]:
-                                part["text"] = "<empty_content>"
+                                part["text"] = ""
                             parts.append({"text": part["text"]})
                         elif part["type"] == "image_url":
                             parts.append(
@@ -156,7 +156,7 @@ class ProviderGoogleGenAI(Provider):
             elif message["role"] == "assistant":
                 if "content" in message:
                     if not message["content"]:
-                        message["content"] = "<empty_content>"
+                        message["content"] = ""
                     google_genai_conversation.append(
                         {"role": "model", "parts": [{"text": message["content"]}]}
                     )