QmlDesigner.NodeInstances: Add debug output

Change-Id: I97ae422fce73ef3df62a66ef4bb925454176f891
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/servernodeinstance.cpp

@@ -37,6 +37,7 @@
 #include "qmlstatenodeinstance.h"
 #include "anchorchangesnodeinstance.h"
 #include "positionernodeinstance.h"
+#include "debugoutputcommand.h"
 
 #include "quickitemnodeinstance.h"
 
@@ -206,10 +207,16 @@ ServerNodeInstance ServerNodeInstance::create(NodeInstanceServer *nodeInstanceSe
         object = Internal::ObjectNodeInstance::createComponentWrap(instanceContainer.nodeSource(), nodeInstanceServer->imports(), nodeInstanceServer->context());
     } else if (!instanceContainer.nodeSource().isEmpty()) {
         object = Internal::ObjectNodeInstance::createCustomParserObject(instanceContainer.nodeSource(), nodeInstanceServer->imports(), nodeInstanceServer->context());
+        if (object == 0)
+            nodeInstanceServer->sendDebugOutput(DebugOutputCommand::ErrorType, QLatin1String("Custom parser object could not be created."));
     } else if (!instanceContainer.componentPath().isEmpty()) {
         object = Internal::ObjectNodeInstance::createComponent(instanceContainer.componentPath(), nodeInstanceServer->context());
+        if (object == 0)
+            nodeInstanceServer->sendDebugOutput(DebugOutputCommand::ErrorType, QString("Component with path %1 could not be created.").arg(InstanceContainer.componentPath()));
     } else {
         object = Internal::ObjectNodeInstance::createPrimitive(instanceContainer.type(), instanceContainer.majorNumber(), instanceContainer.minorNumber(), nodeInstanceServer->context());
+        if (object == 0)
+            nodeInstanceServer->sendDebugOutput(DebugOutputCommand::ErrorType, QLatin1String("Item could not be created."));
     }
 
     if (object == 0) {