Recordselect, multiple => true ... and empty search field does not return all

[Atastor]

I am using current masters of Sergios recordselect and of as. RecordSelect is working great, just one more question (... for now ;-) ) regarding how to use the multiple => true option.

What is not working for me: Leaving the record_selected search field empty translates to the sql partial statement 

WHERE ("record_selected_table"."id" IN (''))

and accordingly returns nothing (which it of course does when leaving the multiple => true). Is this intended behavior? 

Regards

Michael