chore(*): allowing pinning on init, adding test

Author: ChronosSF

projects/igniteui-angular/src/lib/grids/api.service.ts

@@ -86,6 +86,9 @@ export class GridBaseAPIService <T extends IgxGridBaseDirective & GridType> {
     }
 
     public get_row_by_key(rowSelector: any): IgxRowDirective<IgxGridBaseDirective & GridType> {
+        if (!this.grid) {
+            return null;
+        }
         const primaryKey = this.grid.primaryKey;
         if (primaryKey !== undefined && primaryKey !== null) {
             return this.grid.dataRowList.find((row) => row.rowData[primaryKey] === rowSelector);

projects/igniteui-angular/src/lib/grids/grid/row-pinning.spec.ts

@@ -223,6 +223,17 @@ describe('Row Pinning #grid', () => {
             expect(grid.getRowByIndex(1).rowID).toBe(fix.componentInstance.data[1]);
         });
 
+        it('should allow pinning onInit', () => {
+            expect(() => {
+                fix = TestBed.createComponent(GridRowPinningComponent);
+                grid = fix.componentInstance.instance;
+                grid.pinRow(fix.componentInstance.data[1]);
+                fix.detectChanges();
+            }).not.toThrow();
+            expect(grid.pinnedRows.length).toBe(1);
+            expect(grid.getRowByIndex(0).rowID).toBe(fix.componentInstance.data[1]);
+        });
+
         it('should pin rows when columns are grouped.', () => {
             grid.height = '550px';
             fix.detectChanges();