961fc9e041
The update_credentials_and_rearm() may get "empty" credentials from _creds_provider_chain.get_aws_credentials() -- it doesn't throw, but returns default-initialized value. In that case the expires_at will be set to time_point::min, and it's probably not a good idea to arm the refresh timer and, even worse idea, to subtract 1h from it. Fixes #29056 Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Closes scylladb/scylladb#29057