Not sure if my latest question in this thread "fell through the cracks" or not...

So I will attempt to answer it myself and you guys tell me, if it is right or not:

if an empty string '' is passed as a parameter into the creation of a Labkey filter object call with filter type IN, then such a filter filters out (somehow) all of the records in the store...

This is from my experience while dealing with it, I am not sure how/why it does that...