Added error message if no images are given

app.py

@@ -364,6 +364,15 @@ def on_submit_btn_click(model_name, true_name, prompts, images):
         </div>
     """
 
+    if images is None or len(images) < 1:
+        return None, None, f"""<br>
+        <div class="error-message" style="background-color: #fce4e4; border: 1px solid #fcc2c3; padding: 20px 30px; border-radius: var(--radius-lg);">
+            <span class="error-text" style="color: #cc0033; font-weight: bold;">
+                No images are given. Images are needed to determin whether {true_name} was in the dataset. Please upload at least a single image of {true_name}.
+            </span>
+        </div>
+    """
+
     # calculate the image embeddings
     img_embeddings = calculate_image_embeddings(model_name, images)
 
@@ -538,7 +547,7 @@ with block as demo:
             <br><br>
             <b>How does it work?</b> We are giving CLIP your images and let it choose from 1000 possible names. 
             As CLIP is predicting the names that match the given images, we can probe whether the model has seen your images 
-            during training.
+            during training. The more images you upload the more confident you can be in the result!
           </p>
         </div>
         """