[#5854] Fixed SVN.last_commit_ids when given a single path

Signed-off-by: Cory Johns <johnsca@geek.net>
[#5854] Make Tree._lcd_map handle bad LastCommit entries better

Signed-off-by: Cory Johns <johnsca@geek.net>
[#5854] Fixed TypeError on bad LCD data

Signed-off-by: Cory Johns <johnsca@geek.net>