Exception not handled properly in Id4meLogon#getPayloadFromJwt
The method Id4meLogon#getPayloadFromJwt ignores an Exception when parsing a JSON web token and returns null in that case.
However, in two places where that method is called (Id4meLogon#getDistributedClaims and Id4meLogon#getUserInfo) the value returned by Id4meLogon#getPayloadFromJwt is not checked against null, so a NullPointerException would be thrown here if an error occurred when parsing the JSON web token.