fix: better error message for stream (#11635)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

api/core/model_runtime/model_providers/openai_api_compatible/llm/llm.py

@@ -478,6 +478,10 @@ class OAIAPICompatLargeLanguageModel(_CommonOaiApiCompat, LargeLanguageModel):
                         usage=usage,
                     )
                     break
+                # handle the error here. for issue #11629
+                if chunk_json.get("error") and chunk_json.get("choices") is None:
+                    raise ValueError(chunk_json.get("error"))
+
                 if chunk_json:
                     if u := chunk_json.get("usage"):
                         usage = u