hg->hg convert with filemap fails

[MK-MacPorts at techno.ms]

On May 12, 2013, at 11:41 PM, MK-MacPorts at techno.ms wrote:
> $ cat .hgtags 
> 12ed9c6fa642fb0e76866c5955db964d45c217e2 ImprovedServerConfig-Integration_Slots
> bee03cb71ea25641a21c560dd6597cc6a06d9553 ImprovedServerConfig-Integration_Slots
> 0000000000000000000000000000000000000000 ImprovedServerConfig-Integration_Slots

The branch ImprovedServerConfig-Integration_Slots is actually a closed one!

Can it be that the above three entries are residues of some previously failed merging or so?