Photoviewer demo prints several warnings

Several warnings are output by the photoviewer demo, like:

created new network access manager for QDeclarativeEngine(0x84979c4)
QObject::setParent: Cannot set parent, new parent is in a different thread
created new network access manager for QDeclarativeImageRequestHandler(0xb3d49a98)
file:///home/leo/dev/qt-qml/demos/declarative/photoviewer/PhotoViewerCore/PhotoDelegate.qml:19: Unable to assign [undefined] to double
file:///home/leo/dev/qt-qml/demos/declarative/photoviewer/PhotoViewerCore/PhotoDelegate.qml:5: Unable to assign [undefined] to double