get the value from pass identified by 'entry'

def get(self, entry):
        """
        get the value from pass identified by 'entry'
        """
        try:
            output = yield utils.getProcessOutput(
                "pass",
                args=[entry],
                env=self._env
            )
            return output.decode("utf-8", "ignore").splitlines()[0]
        except IOError:
            return None