bugfix: inputs/.TNRS/schema.sql: tnrs__match_num__fill(): only fill if not set, to support case where tnrs is being restored from a .sql file (where match_num is already set)
bugfix: inputs/.TNRS/schema.sql: tnrs__match_num__fill(): only fill if not set, to support case where tnrs is being restored from a .sql file (where match_num is already set)