[+] Fixed a bug related to the fact that if the argument was not a string,...

[+] Fixed a bug related to the fact that if the argument was not a string, then an exception was not thrown, and if the hash was passed in the wrong format, then an empty object of the ChainHashFast type was returned and its further use could lead to a sigmatization error. Now, if the fromString function does not accept a string, then an exception is set, and if a string is received but of the wrong format, an object of type None will be returned.