Prevent crash if no "Copy To" is active and user selects "Copy To None"

CCBUG: 234330

svn path=/trunk/KDE/kdebase/apps/konsole/; revision=1114807

src/SessionController.cpp

@@ -773,6 +773,9 @@ void SessionController::copyInputToSelectedTabs()
 
 void SessionController::copyInputToNone()
 {
+    if (!_copyToGroup)      // No 'Copy To' is active
+        return;
+
     QSet<Session*> group =
        QSet<Session*>::fromList(SessionManager::instance()->sessions());
     for(QSet<Session*>::iterator iterator = group.begin();