I made a simple applescript app to run a shell script and display a notification when it ends, it runs pretty well but I did't want the app appearing in the dock, so I added LSUIElement = true in the info.plist, and now the script runs but the app does not notify. Is there a way to have a background app (does not appear in the dock) with the ability to display notifications?
use the following in your .plist instead
<key>LSBackgroundOnly</key>
<integer>1</integer>
And check Notification Center settings specifically for your applet. While editing your applet, de editor is the one sending the notifications. While running the applet, it's the applet who sends the notifications. So, maybe that's why it works while editing but not when you run the applet.