NPE when trying to add null Map or List claims

[DanilaVaratyntsev]

Description

I'm getting a NullPointerException in JWTCreator#validateClaim(List<?>) and JWTCreator#validateClaim(Map<?, ?>) methods when trying to add a null map or list claim.

At the same time, JWTCreator#addClaim(String, Object), that would be called after validation, accepts null values and deletes a claim in this case.

I guess, validation can be performed only on not-null maps and lists.

Please, excuse me for wasting your time if it's an expected behavior.

Reproduction

Code sample for List:

JWT.create()
    .withClaim("listClaim", (List<String>) null)
    .sign(Algorithm.HMAC256("MySecret"));

Code sample for Map:

JWT.create()
    .withClaim("mapClaim", (Map<String, ?>) null)
    .sign(Algorithm.HMAC256("MySecret"));

[lbalmaceda]

👋 Thanks for reaching out. I think those 2 methods should keep the behavior of the other withClaim methods. This is, whenever a key is non-null but the value is null, remove that key from the final claims set.
I'll move it to the backlog.

[lbalmaceda]

We should be able to release this next week. Thanks