(field)
return OR(missing(field), term(field, ''))
Only return docs with a missing or null value for ``field``
Only return docs with a missing or null value for ``field``
Only return docs with a missing or null value for field
def empty(field):
    """Only return docs with a missing or null value for ``field``"""
    return OR(missing(field), term(field, ''))
def empty ( field ) : return OR ( missing ( field ) , term ( field , '' ) )