Iterate MJoin options and show text box with labels

Link to test case:
Debugger code (debug.datatables.net):
Error messages shown:
Description of problem: Hi
I have an MJoin as per https://datatables.net/forums/discussion/62907 which displays options. I need to show these as labels with a text box so users can enter a quantity value.Here's the MJoin:

                editor.MJoin(new MJoin("DDIs")
                    .Model<SubsPacksDBModel.DDIs>()
                    .Name("GlobalPacksDDIs")
                    .Link("GlobalSubsPacks.id", "GlobalSubsPacksRelations.SubPackID")
                    .Link("DDIs.id", "GlobalSubsPacksRelations.ParamID")
                    .Where(q =>
                        q.Where("GlobalSubsPacksRelations.ParamType", "3", "=")
                    )
                    .Order("DDIs.id ASC")
                    .Field(new Field("id")
                        .Options(new Options()
                            .Table("DDIs")
                            .Value("id")
                            .Label(new[] { "DdiNumber", "Description" })
                        )
                    )
                );

                    }, {
                        label: '',
                        name: 'GlobalPacksDDIs[].id',
                        type: 'text',
                        data: function (row, type, val) {

                            if (IsNullOrEmpty2(row.GlobalPacksDDIs.Description))
                            {
                                return row.GlobalPacksDDIs.DdiNumber;
                            }
                            else
                            {
                                return row.GlobalPacksDDIs.DdiNumber + ' (' + row.GlobalPacksDDIs.Description + ')';
                            }
                        }
                    }

If I choose a checkbox the boxes show but nothing shows if I specify field type 'text' (with the if else statement commented out). I need to show the DdiNumber and Description together as per the if else statement if the Description is non null. Thanks.