Steps to Reproduce

run the attached example

1. add items to the list model by clicking "add element" 2x or more
2. click "clear model"
3. add more items

Actual Result

after adding the second item the grid/listbox doesn't react anymore
adding an item to an empty model (after "clear model") causes a JS error

Expected Result

all added elements should be rendered

Debug Info

when specifying a sordDirection the problem doesn't occur

Root Cause

in Grid.onListDataChange !isIgnoreSortWhenChanged() prevents rendering new items causing the JS error