NullPointerException in KeyType.parse(null)

[Ralf Wagner]

While the constructor for KeyType throws an IllegalArgumentException when called with null for the key type, the static factory method KeyType.parse throws a NullPointerException.

The behaviour would be more consistent, if an IllegalArgumentException would be reported in both cases.

[Vladimir Dzhuvinov]

Fixed in commit befbaf77145fbdbbcbea7b8fffe610214b9c947c from PR.