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Default dict if parent class returned None
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@ -122,7 +122,7 @@ class VeraSwitch(ToggleEntity):
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@property
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def state_attributes(self):
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attr = super().state_attributes
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attr = super().state_attributes or {}
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if self.vera_device.has_battery:
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attr[ATTR_BATTERY_LEVEL] = self.vera_device.battery_level + '%'
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