[PyQt] import QtQuick.Dialogs hangs

[Cody Scott]

When I import QtQuick.Dialogs 1.2 in QML I don't get an error but the
Window is never displayed. Oddly when I load the QML with as bytes it works.

Here is the test case.
https://gist.github.com/Siecje/7948458a7e46f7e7033b7efe07ee7351

If I press Ctrl+Break I get

QMutex: destroying locked mutex
QMutex: destroying locked mutex
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