Don't crash script when some controller configs don't have URLs.

scripts/generate_emu_config.py

@@ -183,12 +183,17 @@ def download_published_file(client, published_file_id, backup_directory):
     with open(os.path.join(backup_directory, "info.txt"), "w") as f:
         f.write(str(ugc_info.body))
 
+    if len(file_details.file_url) > 0:
         with urllib.request.urlopen(file_details.file_url) as response:
             data = response.read()
             with open(os.path.join(backup_directory, file_details.filename.replace("/", "_").replace("\\", "_")), "wb") as f:
                 f.write(data)
             return data
         return None
+    else:
+        print("Could not download file", published_file_id, "no url (you can ignore this if the game doesn't need a controller config)")
+        return None
+
 
 def get_inventory_info(client, game_id):
     return client.send_um_and_wait('Inventory.GetItemDefMeta#1', {