Page settings crash for empty tab

Steps to reproduce:
1. In the preferences choose "continue last session"
2. Create a new score and add a not or two (close any other MuseScore tabs you may have open besides the new score)
3. Without ever saving the new score force quit MuseScore (to simulate a crash)
4. Restart MuseScore
5. When it asks if you want to restore the previous session choose "No" (Notice that MuseScore opens an empty tab, with no score in it)
6. Layout > Page Settings...

-> MuseScore crashes

Discussion: May be related to: #10048: Opening Page Settings causes crash

Tested using nightly build r. 4227

(Windows 7)