Getting exception when setting delete in SendLocalList with differential update

[jmluy]

I'm trying to do a delete by sending a local list using a differential update and it's causing an NullPointerException.

Based on the OCPP 1.6 document on section 7.1, when you want to delete on a differential update, you can do it by not setting the IdTagInfo. Setting the IdTagInfo means it's for add/edit. NPE occurs because of the call to IdTagInfo.validate() in AuthorizationData.validate().

I think it should either allow null on the validate for AuthorizationData like
return ModelUtil.validate(idTag, 20) && (idTagInfo == null || idTagInfo.validate());
or validate() in SendLocalList should check update type and allow null IdTagInfo or call AuthorizationData.validate.