Fix error if no view supplements defined
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@ -3883,7 +3883,7 @@ class MasterView(View):
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"""
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Iterate over all registered supplements for this master view.
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"""
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supplements = self.request.registry.settings['tailbone_view_supplements']
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supplements = self.request.registry.settings.get('tailbone_view_supplements', [])
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route_prefix = self.get_route_prefix()
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if supplements and route_prefix in supplements:
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for cls in supplements[route_prefix]:
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