Added message.

src/rupload/app.py

@@ -280,6 +280,8 @@ async def handle_index(request: web.Request):
         message = message[: message.find("here: ") + len("here: ")]
         message += f'<a href="{url}">'
         message += f"{url}</a>"
+    if not message:
+        message = "Any file type is allowed thus also binary/executable or source files."
     if message:
         message += "<br /><br />"
     html_content = html_content.replace("[message]", message)