return parent style method when option passed to tabBar rect is invalid, instead of full option rect

removed check on invalid tabbar size
BUG: 344779

kstyle/breezestyle.cpp

@@ -1547,11 +1547,10 @@ namespace Breeze
 
         // cast option and check
         const QStyleOptionTabWidgetFrame* tabOption = qstyleoption_cast<const QStyleOptionTabWidgetFrame*>( option );
-        if( !tabOption ) return option->rect;
+        if( !tabOption ) return ParentStyleClass::subElementRect( SE_TabWidgetTabBar, option, widget );
 
         // do nothing if tabbar is hidden
         const QSize tabBarSize( tabOption->tabBarSize );
-        if( tabBarSize.isEmpty() ) return option->rect;
 
         QRect rect( option->rect );
         QRect tabBarRect( QPoint(0, 0), tabBarSize );