Don't expand empty [paths] so later interpolation can do the right thing.
Example:
[paths]
default =
default-push = %(default)s
adding aadding baNONEXISTENT: No such file or directoryaba: No such file or directoryNONEXISTENT: No such file or directorybaNONEXISTENT: No such file in rev 9e1684505872ab