Update main.py

main.py

@@ -122,20 +122,25 @@ def check_auth(authorization: str | None):
 def run_chain(chain, input_dict: dict):
     """
     Safely run a LangChain PromptTemplate | HuggingFaceEndpoint chain.
-    Converts output to string and captures errors.
+    Returns non-empty string, or detailed error info for debugging.
     """
     try:
         # Render template
-        if hasattr(chain, "prompt"):
-            prompt_text = chain.prompt.format(**input_dict)
-        else:
-            prompt_text = str(input_dict)
+        prompt_text = chain.prompt.format(**input_dict) if hasattr(chain, "prompt") else str(input_dict)
 
-        # Generate using HuggingFaceEndpoint (expects str input)
+        # Generate using HuggingFaceEndpoint
         output = chain.llm.generate([{"role": "user", "content": prompt_text}])
-        return output.generations[0][0].text.strip()
+
+        # Get text safely
+        text = getattr(output.generations[0][0], "text", "") or ""
+        text = text.strip()
+
+        if not text:
+            return {"success": False, "error": "⚠️ LLM returned empty output", "prompt": prompt_text}
+
+        return text
     except Exception:
-        return {"success": False, "error": "⚠️ LLM error", "details": traceback.format_exc()}
+        return {"success": False, "error": "⚠️ LLM error", "details": traceback.format_exc(), "prompt": prompt_text}
 
 async def process_audio(file: UploadFile, lang_hint: str | None = None):
     suffix = os.path.splitext(file.filename)[1] or ".wav"