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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _clean_fields(self):
 """ Overriding the default cleaning behaviour to exit early on errors instead of validating each field. """

        try:
            super(OAuthForm, self)._clean_fields()
        except OAuthValidationError, e:
            self._errors.update(e.args[0])