snapcraft release gives misleading error when revision does not exist

[Mark Shuttleworth]

If you try to release a revision which does not exist, you see:

Sorry, try `snapcraft register etcd` before trying to release or choose an existing revision.

The misleading part is that the snap is already registered, it's purely a 'non-existent revision' problem.

[Leo Arias (elopio)]

Confirmed.

elopio@briseis:~$ snapcraft status vault-elopio
Arch Channel Version Revision
amd64 stable v0.6.2 10
        candidate v0.6.5 108
        beta ^ ^
        edge master 115
elopio@briseis:~$ snapcraft release vault-elopio 120 edge
Sorry, try `snapcraft register vault-elopio` before trying to release or choose an existing revision.