initial column grouping failed

Hi,

When i try to initially grouping column using groups option like this : groups: ['fieldToGroup'],
i have a javascript exception.

Effectevely, in getGrouping at line 984 [if (!cols[depth].isAggCol && depth <= maxDepth) {], cols constains 0 element, and there that's failed.

Has anyone the problem solving or it's a bug ?

I have done a plunker to illustrate the bug http://plnkr.co/edit/LYwbyf !
Jérôme

Start by reproducing the exception with the linked Plunker and inspect getGrouping around line 984, where cols is empty during initial grouping with groups: ['fieldToGroup']. Trace why the columns collection is empty and verify that the same grouping configuration completes without a JavaScript exception.

Written by the indexing model from the issue text.