fields: protect against invalid validation schema (#35400)
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@ -1001,7 +1001,7 @@ class WcsExtraStringWidget(StringWidget):
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StringWidget._parse(self, request)
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if self.field and self.field.validation and self.value is not None:
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validation_function = ValidationWidget.get_validation_function(self.field.validation)
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if not validation_function(self.value):
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if validation_function and not validation_function(self.value):
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self.error = _('invalid value')
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