Qt 5.0.2, PyQt5, Linux, QPageSetupDialog empty or missing

[bootchk]

The QPageSetupDialog fails to appear (or is empty).

I think this is a bug, since similar code was working before.

Here is a reduced version that demonstrates the bug.
@import sys

from PyQt5.QtCore import Qt, QObject
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtPrintSupport import QPrinter, QPageSetupDialog

class PrintConverser(QObject):

def doPageSetup(self):
print("Opening page setup dialog")
printer = QPrinter()
assert printer.isValid()
dialog = QPageSetupDialog(printer)

dialog.accepted.connect(self.acceptSlot)
dialog.rejected.connect(self.acceptSlot)

# Choose one: all are broken:
#dialog.open() # window modal, but no dialog appears
#dialog.show()  # modeless, but no dialog appears
dialog.exec_()  # app modal, dialog box appears but is empty

def acceptSlot(self):
print('accepted or canceled')

def main():
app = QApplication(sys.argv)
mainWindow = QMainWindow()
mainWindow.setGeometry(100, 100, 500, 40)

printConverser = PrintConverser()

button = QPushButton("Setup page")
button.clicked.connect(printConverser.doPageSetup)
mainWindow.setCentralWidget(button)
mainWindow.show()

sys.exit(app.exec_())

if name=="main":
main()@

[bootchk]

This was also reported by someone else and fixed here: https://bugreports.qt-project.org/browse/QTBUG-31790.

It affects Qt5.0.x up to 5.1.1 where it was fixed. Ubuntu 13.4 ships with Qt5.02 and doesn't seem to update with the bug fix. I suppose there are not many Qt apps on Ubuntu. I am surprised this bug wasn't found or reported by KDE, maybe KDE is not on Qt5.02 yet.