ScriptingEngine::Private: avoid dereferencing null pointer, fix Windows crash
ScriptingEngine::Private: avoid dereferencing null pointer, fix Windows crash

pranavrc/example-gluon,KDE/gluon,pranavrc/example-gluon,KDE/gluon,KDE/gluon,pranavrc/example-gluon,KDE/gluon,pranavrc/example-gluon