Include what parameter was missing when throwing in DefaultIdSiteCallbackHandler.getRequiredValue

[dogeared]

This is the current code:

    private <T> T getRequiredValue(Map jsonMap, String parameterName) {
        Object object = jsonMap.get(parameterName);
        if (object == null) {
            throw new InvalidJwtException(InvalidJwtException.JWT_RESPONSE_MISSING_PARAMETER_ERROR);
        }
        return (T) object;
    }

Add parameterName into the message passed into the InvalidJwtException constructor.