fix empty upload

app.py

@@ -10,6 +10,10 @@ DATASET_NAME = "beetle_papers"
 
 # Function to upload the files and save them to the dataset
 def upload_files(file_paths):
+    # Check if any files were provided
+    if not file_paths:
+        return "Please select a file to upload."
+
     # Attempt to load the dataset or create a new one if it doesn't exist
     try:
         dataset = load_dataset(f"ChristopherMarais/{DATASET_NAME}")
@@ -43,7 +47,7 @@ def upload_files(file_paths):
     dataset.push_to_hub(DATASET_NAME, token=HUGGINGFACE_TOKEN)
     
     # Return a message indicating the success of the uploads
-    return f"File(s) uploaded successfully!"
+    return "File(s) uploaded successfully!"
 
 # Function to clear the upload file list
 def clear_files():