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background_image = BackgroundType.to_string(BackgroundType.Image)
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if self.page(self.currentId()) == self.backgroundPage and \
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QtGui.QMessageBox.critical(self, translate('OpenLP.ThemeWizard', 'Background Image Empty'),
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translate('OpenLP.ThemeWizard', 'You have not selected a '
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'background image. Please select one before continuing.'))