Change language setting causes crash, if no score is open

7f85859, Windows 7

stack trace:
1 Ms::SelectionFilter::setFiltered select.cpp 1244 0x77729d
2 Ms::SelectionWindow::changeCheckbox selectionwindow.cpp 161 0x4bd491
3 Ms::SelectionWindow::qt_static_metacall moc_selectionwindow.cpp 147 0x69debd
4 ZN11QMetaObject8activateEP7QObjectiiPPv 0x68a08842
5 ZN15QListWidgetItem8setFlagsE6QFlagsIN2Qt8ItemFlagEE 0x1b78ddf0
6 ?? 0xf
7 ?? 0x5
8 ?? 0x1c010358
9 ?? 0x28c984