You can skip this commit if you add a local svn.$REVNUM tag to the head revision (=the revision which also has the svn.($REVNUM-1) tag now). Then you can continue with hgpullsvn.
Say your import is at this state (last imported rev is 15800, the property-only rev is 15801):
$ hg log -l1
changeset: 1234:123456789abc
branch: trunk
tag: tip
tag: svn.15800
parent: 1233:cba987654321
user: Rudi <[email protected]>
date: Tue Aug 24 11:42:23 2010 +0200
summary: Foobar
$ svn info
Path: .
URL: svn+ssh://example.com/foobar/trunk
Repository Root: svn+ssh://example.com/foobar
Repository UUID: 26c7c274-8ed1-4e7f-bdc1-5c767a948b10
Revision: 15801
Node Kind: directory
Schedule: normal
Last Changed Author: rudi
Last Changed Rev: 15801
Last Changed Date: 2010-08-24 14:00:29 +0200 (Di, 24 Aug 2010)
Then you simply add the svn.15801 tag:
$ hg tag -l -r 123456789abc svn.15801
and contunie to import.
But make a backup before you try this.