TBR mojo+syncbase: use default blessings if SelectAccount fails
TBR mojo+syncbase: use default blessings if SelectAccount fails

Change-Id: I06f88d0a72ef9f0ebc6d8aa825b350ca291cb546

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref