Merge pull request #6397 from IgniteUI/zkolev/revert-change-6376-82x-81x

fix(revert): revert change of PR #6376

Author: zdrawku

projects/igniteui-angular/src/lib/grids/grid-base.component.ts

@@ -1864,7 +1864,7 @@ export abstract class IgxGridBaseComponent extends DisplayDensityBase implements
      * @hidden
      */
     public get parentRowOutletDirective() {
-        return null;
+        return this.outletDirective;
     }
 
     /**

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

@@ -402,14 +402,6 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseCompone
     public get outletDirective() {
         return this.rootGrid._outletDirective;
     }
-
-    /**
-     * @hidden
-     */
-    public get parentRowOutletDirective() {
-        return this === this.rootGrid ? null : this.rootGrid.rowEditingOutletDirective;
-    }
-
     /**
      * @hidden
      */