Only assign a new revision if the commit was successful/actually happened.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25956 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
update to r1632339 of the svn trunk

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25957 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac