fix regression in unpack cmd rejecting nonexistent dirs.
fix regression in unpack cmd rejecting nonexistent dirs.

This is what you get for putting literally any features at all in your main funcs without covering them in full end-to-end testing.  >.>  Perhaps we're approaching the time where we should refactor and get these cmd funcs their own package and tests.

Signed-off-by: Eric Myhre <2346ad27d7568ba9896f1b7da6b5991251debdf2@exultant.us>

polydawn/rio,polydawn/rio