If no keyring exists I'm prompted to create a new keyring.  If I say Deny, I get
brought back to the access point passphrase box.  It should just continue.

If a keyring exists, I get prompted for the keyring passphrase to store the
access point key, and again I can't opt out, or I'll get prompted for the access
point passphrase again and NM won't continue.

I should be able to not use the keyring to store passphrases for my access points.