Fix possible crash in KStandardItemListWidget::paint()
According to the backtrace in the bug report, it is possible that KStandardItemListWidget::paint() is called if the hash m_textInfo has not been initialised. The widget's index must be -1 in this case, see KStandardItemListWidget::triggerCacheRefreshing(). It looks like this can only happen if the item is about to be removed from the view, see KItemListView::slotItemsRemoved(). I could not reproduce the crash, so I'm not sure why exactly this happens, but this commit should at least prevent the crash. BUG: 306167 FIXED-IN: 4.9.2
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