Shortcuts & Notification improvement

When you edit music information, then you have options to move between the forms with TAB and Shift + TAB, i suggest to also use "Enter". How? Simple. When you edit music information and you press Enter, the information is saved and the window closes. Nothing special, but very useful.

Secondly about the notifications. There is no need to display the unknown album. I find it annoying, that if album name isn't entered, i see "Unkown" popping up in the notifications area all the time.