[Qt-creator] QtCreator(0.9.2RC1) crash when press F1 to lookup wrong keyword on Mac

[night]

This bug occur sine 0.9.1,
when use cpp editor, if your cursor locate any word that no any
document, (class name, function name etc.),
and if you press F1 to lookup the help, then, help window show "no
doucment",
and QtCreator crash.


Qt: 4.5.0
QtCreator: 0.9.1~0.9.2RC1
Leopard 10.5.6