git-svn: avoid warning when run without arguments
git-svn: avoid warning when run without arguments

While we're in the area, finish writing a halfway-written
comment describing what that block does...

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git