Fix crash when using corner defBtnIndicator and no colored mouse over.
Fix crash when using corner defBtnIndicator and no colored mouse over.


KDE/qtcurve,gnufabio/qtcurve,KDE/qtcurve,gnufabio/qtcurve,KDE/qtcurve,gnufabio/qtcurve,gnufabio/qtcurve,KDE/qtcurve