Handle DeepSeek reasoning_content fallback for empty responses

assistant/assistant.py

@@ -170,12 +170,18 @@ class Assistant(commands.Cog):
             return f"Request failed: {exc}"
 
         try:
-            reply = data["choices"][0]["message"]["content"]
+            choice = data["choices"][0]["message"]
+            reply = choice.get("content") or ""
+            # Some models (e.g. DeepSeek) put their response in reasoning_content
+            if not reply.strip():
+                reasoning = choice.get("reasoning_content") or ""
+                if reasoning.strip():
+                    reply = reasoning
         except (KeyError, IndexError):
             return f"Unexpected API response: {str(data)[:300]}"
 
-        if not reply:
-            return f"Empty response. Raw: {str(data)[:300]}"
+        if not reply or not reply.strip():
+            return "The model returned an empty response. Try rephrasing or switching models."
 
         self.history[key].append({"role": "assistant", "content": reply})