NPE from JWX.setKey using HSM

[Brian Campbell]

NullPointerException is being thrown from key.equals(...) when using nCipher/Thales HSM.

Seems the normal implementation of the Key interface can handle null input and return false where the KMKey cannot.

The logic in JsonWebStructure.setKey(...) needs to be updated to accommodate this situation.

failed to issue token
java.lang.NullPointerException
        at com.ncipher.provider.km.KMKey.equals(KMKey.java:178) ~[nCipherKM.jar:?]
        at org.jose4j.jwx.JsonWebStructure.setKey(JsonWebStructure.java:203) ~[jose4j.jar:?]
        at ...

[Brian Campbell]

Fix #80 where an NPE was being thrown from JWX.setKey() when using an HSM JCA provider

→ <<cset 77895c36e2d5>>

[Brian Campbell]

address with 77895c3 "Fix #80 where an NPE was being thrown from JWX.setKey() when using an HSM JCA provider"

[Brian Campbell]

in v 0.5.3