When a CWallet doesn't have a ScriptPubKeyMan for the requested type
in GetNewDestination, give a meaningful error. Also handle this in
Qt which did not do anything with errors.
Backport of Core PR16528 [39/43] : https://github.com/bitcoin/bitcoin/pull/16528/commits/3c19fdd2a2fd5394fcfa75b2ba84ab2277cbdabf