AFM.NativeTotalItem potential unsafe constructors #551

While I was trying to work with NativeTotalItem.java. I found there one unnecessary attributeIdentifiers collection check in first constructor:

this.attributeIdentifiers = attributeIdentifiers == null ? Collections.emptyList() : attributeIdentifiers;

Problem is that this class has two constructors
NativeTotalItem(String, String...)
NativeTotalItem(String, List<String>)

So if accidentally somebody will create native total item in JSON with attributeIdentifiers = null this will fail as it would not be able to pick right constructor NativeTotalItem(String, null) matches both constructors.

I see here two options how to solve it:

a) remove null check in first constructor as its not needed
b) remove second constructor as they are pretty much the same and looks to me like shortcut