fix: 修复消息处理流程中可能出现的空消息

astrbot/core/provider/entities.py

@@ -155,7 +155,7 @@ class ProviderRequest:
         if self.image_urls:
             user_content = {
                 "role": "user",
-                "content": [{"type": "text", "text": self.prompt}],
+                "content": [{"type": "text", "text": self.prompt if self.prompt else "[图片]"}],
             }
             for image_url in self.image_urls:
                 if image_url.startswith("http"):

astrbot/core/provider/sources/openai_source.py

@@ -497,7 +497,7 @@ class ProviderOpenAIOfficial(Provider):
     async def assemble_context(self, text: str, image_urls: List[str] = None) -> dict:
         """组装成符合 OpenAI 格式的 role 为 user 的消息段"""
         if image_urls:
-            user_content = {"role": "user", "content": [{"type": "text", "text": text}]}
+            user_content = {"role": "user", "content": [{"type": "text", "text": text if text else "[图片]"}]}
             for image_url in image_urls:
                 if image_url.startswith("http"):
                     image_path = await download_image_by_url(image_url)