Port 13846

Port from hotfix-13846

The following changes and checks have been added:

1. Added a check to the wallet signature verification function to make sure that the wallet certificate is loaded at all, otherwise an error message is displayed.
2. Added NULL check for a key that was derived from a wallet certificate.
3. Added error output in wallet info if a wallet contains a barb whose type is not supported.

merged

mentioned in commit 354ff238