QmlDesigner: do not show warning for qml2puppet in 2.6

Since Qt Quick 2.0 is not supported the message about the
missing qml2puppet is just confusing.

Task-number: QTCREATORBUG-7858

Change-Id: I4c4454ff1179459456523b540cee7d395aaf8c5c
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

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

@@ -194,21 +194,23 @@ NodeInstanceServerProxy::NodeInstanceServerProxy(NodeInstanceView *nodeInstanceV
            }
 
        } else {
-           QMessageBox::warning(0, tr("Cannot Start QML Puppet Executable"),
-                                tr("The executable of the QML Puppet process (%1) cannot be started. "
-                                   "Please check your installation. "
-                                   "QML Puppet is a process which runs in the background to render the items.").
-                                arg(applicationPath));
+           if (!hasQtQuick2(m_nodeInstanceView.data()))
+               QMessageBox::warning(0, tr("Cannot Start QML Puppet Executable"),
+                                    tr("The executable of the QML Puppet process (%1) cannot be started. "
+                                       "Please check your installation. "
+                                       "QML Puppet is a process which runs in the background to render the items.").
+                                    arg(applicationPath));
        }
 
        m_localServer->close();
 
    } else {
-       QMessageBox::warning(0, tr("Cannot Find QML Puppet Executable"),
-                            tr("The executable of the QML Puppet process (%1) cannot be found. "
-                               "Please check your installation. "
-                               "QML Puppet is a process which runs in the background to render the items.").
-                            arg(applicationPath));
+       if (!hasQtQuick2(m_nodeInstanceView.data()))
+           QMessageBox::warning(0, tr("Cannot Find QML Puppet Executable"),
+                                tr("The executable of the QML Puppet process (%1) cannot be found. "
+                                   "Please check your installation. "
+                                   "QML Puppet is a process which runs in the background to render the items.").
+                                arg(applicationPath));
    }
 }