Abort effect if the current tab box window is deleted and the tabbox is empty...
Abort effect if the current tab box window is deleted and the tabbox is empty afterwards. This hopefully resolves the crashes when a window is closed during active effect. At least I was not able to reproduce a crash anymore. If further testing shows that it resolves the problem the patch will be backported to branch and to other window switching effects showing the same problem. CCBUG: 182358 svn path=/trunk/KDE/kdebase/workspace/; revision=919075
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