AppOutputPane: Fix wrong assert

This can actually happen and is not a problem

Task-number: QTCREATORBUG-12871
Change-Id: I0bcca39f160362a5c67cfceaefa5dd9d58d69b55
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/appoutputpane.cpp

@@ -605,7 +605,9 @@ void AppOutputPane::slotRunControlFinished2(RunControl *sender)
 {
     const int senderIndex = indexOf(sender);
 
-    QTC_ASSERT(senderIndex != -1, return);
+    // This slot is queued, so the stop() call in closeTab might lead to this slot, after closeTab already cleaned up
+    if (senderIndex == -1)
+        return;
 
     // Enable buttons for current
     RunControl *current = currentRunControl();