the issue occurs only when you use the cross x button to remove all selected items from Chosenbox and then click outside of Chosenbox (if you tab out using keyboard the emtyMessage reappears).
Steps to reproduce
1. Select some items
2. Remove items by clicking the x button on selected item lables
3. after the selection is empty click outside of chosenbox
Chosenbox shows the emptyMessage
Chosenbox doesn't show emptyMessage (it can show if you tab out after selection is empty)