Add a protective check against a null menu shell.
Add a protective check against a null menu shell.
sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,GNOME/gtk-mac-integration,GNOME/gtk-mac-integration,jralls/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,GNOME/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration