add mistral error handling

app.py

@@ -186,12 +186,18 @@ def generate(
         if "Too Many Requests" in str(e):
             print("ERROR: Too many requests on mistral client")
             gr.Warning("Unfortunately Mistral is unable to process")
-            output = "Unfortuanately I am not able to process your request now !"
+            output = "Unfortuanately I am not able to process your request now, too many people are asking me !"
+        elif "Model not loaded on the server" in str(e):
+            print("ERROR: Mistral server down")
+            gr.Warning("Unfortunately Mistral LLM is unable to process")
+            output = "Unfortuanately I am not able to process your request now, I have problem with Mistral!"
         else:
             print("Unhandled Exception: ", str(e))
             gr.Warning("Unfortunately Mistral is unable to process")
             output = "I do not know what happened but I could not understand you ."
 
+        yield output
+        return None
     return output