Update app.py

app.py

@@ -306,7 +306,7 @@ class VideoClassifier:
         return final_answer
     
     def save_model_choice(self,model_name='gemini'):
-        self.model_name = model_name
+        self.model_name = model_name or 'gemini'
         if self.model_name=='mistral':
             print("Setting up Mistral model for Class Selection")
             self.setup_mistral_space_model()