Patch KParts::StatusBarExtension...

[Dawit A]

Hi,

The attached patch fixes crashes that occur due to unexpected deletion of the 
m_widget variable in the internal class KParts::StatusBarItem. This can happen 
when a KUrlLabel  is deleted by the application or plugin that added it to the 
status bar for example. 

The patch simply changes the m_widget variable to a QPointer to guard against 
external deletions and checks the validity of the variable before use.

Regards,
Dawit A.
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