Syncing after removing labels/tags in gmail webUI: "cannot be opened"

[Andrey U. <and...@fa...>]

Hi!
Thanks for such a good software.
It seems superior to offlineimap at last because of correct
interruptibility in between of sync process.

But there seems to be an issue when you sync GMail account with
another IMAP mailbox.
If you have synced them, and then you remove labels/tags in GMail web
interface, mbsync gives errors like:

Error: channel gmail_old: master sr-dev cannot be opened.

I'd suppose it would remove such IMAP folders, because these were
exposed as IMAP folders. Or maybe I miss some config option?

I use net-mail/isync-1.2.1 in Gentoo.
Thanks in advance for any advise.