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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 parse_subdomain_missing_zonefiles_record(cls, rec):
 """ Parse a missing-zonefiles vector given by the domain. Returns the list of zone file indexes on success Raises ParseError on unparseable records """

        txt_entry = rec['txt']
        if isinstance(txt_entry, list):
            raise ParseError("TXT entry too long for a missing zone file list")

        try:
            return [int(i) for i in txt_entry.split(',')] if txt_entry is not None and len(txt_entry) > 0 else []
        except ValueError:
            raise ParseError('Invalid integers')