Android: Fix possible crash

Change-Id: I1b73a077f6d2f157d4367358f9f156d32b3e6cea
Task-number: QTCREATORBUG-15832
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/android/androidmanifesteditorwidget.cpp

@@ -599,6 +599,7 @@ void AndroidManifestEditorWidget::postSave()
     if (project) {
         if (Target *target = project->activeTarget()) {
             AndroidQtSupport *androidQtSupport = AndroidManager::androidQtSupport(target);
+            if (androidQtSupport)
                 androidQtSupport->manifestSaved(target);
         }
     }