Grouping with blank cells

[luckduck]

Hi Paramvir,

When grouping, I want to group only when the value of the grouping target cell is not blank.

For example, if the value of item4 is blank, I want to group to item3, and if the value of item4 is not blank, I want to group to item4.

Below is the link of the jsfiddle:
https://jsfiddle.net/bzsgftyk/

Thank you.

[paramvir]

Grouping works with uniform level of grouping only.

However for aesthetics, parent title can be displayed when current grouping title is blank with help of groupModel.titleDefault.

Code: [Select]

    titleDefault: function( ui ){
    var G = this.Group(),
        label = ui.cellData || G.getParent( ui.rowData )[ui.dataIndx];     
        return label + " (" + G.getChildren( ui.rowData ).length + ")";
    },

https://jsfiddle.net/ojmksuap/