Return true if the comment is collapsed by user.

def is_collapsed(self, id_user):
        """Return true if the comment is collapsed by user."""
        return CmtCOLLAPSED.query.filter(db.and_(
            CmtCOLLAPSED.id_bibrec == self.id_bibrec,
            CmtCOLLAPSED.id_cmtRECORDCOMMENT == self.id,
            CmtCOLLAPSED.id_user == id_user)).count() > 0