QmlDesigner.Instances: Changing qDebug to qWarning

A crash of the puppet is kind of expected and we should use
qWarning. Showing the error code might be useful in some cases.

Change-Id: I52b2c3bc727fa7040f931b1cc1eee3545ef5554e
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/designercore/instances/nodeinstanceserverproxy.cpp

@@ -313,9 +313,9 @@ void NodeInstanceServerProxy::writeCommand(const QVariant &command)
     }
 }
 
-void NodeInstanceServerProxy::processFinished(int /*exitCode*/, QProcess::ExitStatus exitStatus)
+void NodeInstanceServerProxy::processFinished(int exitCode, QProcess::ExitStatus exitStatus)
 {
-    qDebug() << "Process finished:" << sender();
+    qWarning() << "Process finished:" << sender() << exitCode;
 
     if (m_captureFileForTest.isOpen()) {
         m_captureFileForTest.close();