KDevelop 2.0 crashed when error message is clicked

[Julian Rockey]

re crash..

> #4  0x806d233 in DocViewMan::doSwitchToFile ()
> #5  0x809d90f in CKDevelop::switchToFile ()
> #6  0x8092fd8 in CKDevelop::slotSwitchToFile ()

The only place I can see a crash could happen is at

      QextMdiChildView* pMDICover = (QextMdiChildView*) 
pEditWidget->parentWidget();
      pMDICover->activate();

If the edit widget has no parent, crash. Of course, this shouldn't happen. 
When edit widgets are created they are always assigned a parent in 
DocViewMan::addQExtMDIFrame. But maybe it is somehow. I've had situations in 
KDevelop 2.0 where the edit windows have been all over the place, especially 
after restarting after a previous crash.

Perhaps an assert or other test at this point would be a good idea, to catch 
it if it happens?

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