Merge pull request #6338 from IgniteUI/mdragnev/fix-6268-8.2.x

fix(hGrid): Fix deleting a filter chip in a child grid #6268

Author: ChronosSF

projects/igniteui-angular/src/lib/grids/hierarchical-grid/child-grid-row.component.ts

@@ -185,6 +185,9 @@ private resolver;
         outputs.forEach(output => {
             if (this.hGrid[output.propName]) {
                 this.hGrid[output.propName].pipe(destructor).subscribe((args) => {
+                    if (!args) {
+                        args = {};
+                    }
                     args.owner = this.hGrid;
                     this.layout[output.propName].emit(args);
                 });