refactored app.py

app.py

@@ -128,7 +128,7 @@ if standard_button:
                 config=st.session_state.config,
                 image_processor=st.session_state.image_processor,
                 prompt=prompt,
-                concepts=concept_name,  # Pass the selected concept
+                concepts=[concept_name] if concept_name else [],  # Pass the selected concept
                 output_dir="concept_images"
             )