Fix RuntimeError in predict_no_ui_long_connection() (#2095)

Bug fix: Fix RuntimeError in predict_no_ui_long_connection()

In the original code, calling predict_no_ui_long_connection() would trigger a RuntimeError("OpenAI拒绝了请求：" + error_msg) even when the server responded normally. The issue occurred due to incorrect handling of SSE protocol comment lines (lines starting with ":"). 

Modified the parsing logic in both `predict` and `predict_no_ui_long_connection` to handle these lines correctly, making the logic more intuitive and robust.

request_llms/bridge_openrouter.py

@@ -170,7 +170,7 @@ def predict_no_ui_long_connection(inputs:str, llm_kwargs:dict, history:list=[],
         except requests.exceptions.ConnectionError:
             chunk = next(stream_response) # 失败了，重试一次？再失败就没办法了。
         chunk_decoded, chunkjson, has_choices, choice_valid, has_content, has_role = decode_chunk(chunk)
-        if len(chunk_decoded)==0: continue
+        if len(chunk_decoded)==0 or chunk_decoded.startswith(':'): continue
         if not chunk_decoded.startswith('data:'):
             error_msg = get_full_error(chunk, stream_response).decode()
             if "reduce the length" in error_msg:
@@ -181,9 +181,6 @@ def predict_no_ui_long_connection(inputs:str, llm_kwargs:dict, history:list=[],
                 raise RuntimeError("OpenAI拒绝了请求：" + error_msg)
         if ('data: [DONE]' in chunk_decoded): break # api2d 正常完成
         # 提前读取一些信息 （用于判断异常）
-        if (has_choices and not choice_valid) or ('OPENROUTER PROCESSING' in chunk_decoded):
-            # 一些垃圾第三方接口的出现这样的错误，openrouter的特殊处理
-            continue
         json_data = chunkjson['choices'][0]
         delta = json_data["delta"]
         if len(delta) == 0: break
@@ -328,8 +325,7 @@ def predict(inputs:str, llm_kwargs:dict, plugin_kwargs:dict, chatbot:ChatBotWith
 
             if chunk:
                 try:
-                    if (has_choices and not choice_valid) or ('OPENROUTER PROCESSING' in chunk_decoded):
-                        # 一些垃圾第三方接口的出现这样的错误, 或者OPENROUTER的特殊处理,因为OPENROUTER的数据流未连接到模型时会出现OPENROUTER PROCESSING
+                    if (has_choices and not choice_valid) or chunk_decoded.startswith(':'):
                         continue
                     if ('data: [DONE]' not in chunk_decoded) and len(chunk_decoded) > 0 and (chunkjson is None):
                         # 传递进来一些奇怪的东西