don't do anything in case nothing is provided.

app.py

@@ -28,6 +28,9 @@ def run(hf_token, text_encoder_weights, unet_weights, repo_prefix):
     if unet_weights == "":
         unet_weights = None
 
+    if text_encoder_weights is None and unet_weights is None:
+        return "❌ No fine-tuned weights provided, nothing to do."
+
     pipeline = run_conversion(text_encoder_weights, unet_weights)
     output_path = "kerascv_sd_diffusers_pipeline"
     pipeline.save_pretrained(output_path)