BUG - ListGrid.groupBy and blank fields produces 0_1 0_2 0_3

[atomatom]

Build: 19 July, SmartGWT Pro

Repro steps: Create a listgrid that has two columns. Column A to group on, and Column B that contains some blank values (my case has some blank, some not). Select Group By on Column A.

Observed: Any blank value in Column B is replaced with 0_i with i ascending from 1 upwards (each unique)

Expected: Blank values stay blank

No test case at this time, will come back to it if I can spare the time.

[atomatom]

Workaround: use "" instead of null in any fields that show this problem. (modified my bean class to return "" if value is null)