bugfix-7338
[+] add func checked hex digits in string
[*] add checking hex digits in hash string in wallet restore
[*] add NULL cert pinter to ledger test
[*] subs update
[*] version bump
[+] add func checked hex digits in string
[*] add checking hex digits in hash string in wallet restore
[*] add NULL cert pinter to ledger test
[*] subs update
[*] version bump