Make IteratingSystem's entities member field accessible from subclass

[monkeyhybrid]

It would be useful to have access to the private member field, entities, from within subclasses of IteratingSystem.

Currently, in some of my classes that extend IteratingSystem, I override update() to carry out some initialisation before processEntity() gets called for each entity. I'd like to skip the initialisation altogether for each engine update that has no relevant entities to process. However, with the entities member field being private, I can't simply check with entities.size().

Could entities be made protected, to allow a subclass to access it directly? Or if not, maybe a protected getter?

[monkeyhybrid]

Just what I was hoping for, cheers!