Qt does not handle the nullptr for hasFocus()

as nullptr exceptions are not handled for hasFocus(), it can lead to crashes 

it requires the nullptr handling to be implemented by us 

what happens is: 

sometimes the widget is not properly initialized & still we try to set the focus which goes to hasFocus() in the flow 

you will find below the stack trace we get in such case (when the null pointer exception happens): 

Stack Trace: ACCESS_VIOLATION 
QWidget::hasFocus:0
QAccessibleWidget::focusChild:0
QAccessibleWidget::focusChild:0
qt_plugin_query_metadata_v2:0
QAccessible::updateAccessibility:0
QWidgetRepaintManager::updateStaticContentsSize:0
QApplicationPrivate::notify_helper:0
QApplication::notify:0 

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