def _get_certificate(self, cfgstr=None):
        """
        Returns the stamp certificate if it exists
        """
        certificate = self.cacher.tryload(cfgstr=cfgstr)
        return certificate
def _get_certificate(self, cfgstr=None):
        """
        Returns the stamp certificate if it exists
        """
        certificate = self.cacher.tryload(cfgstr=cfgstr)
        return certificate
Returns the stamp certificate if it exists