chore(*): remove virtualizationState check

Author: dobromirts

projects/igniteui-angular/src/lib/grids/grid-navigation.service.ts

@@ -249,10 +249,12 @@ export class IgxGridNavigationService {
 
     public isDataRow(rowIndex: number, includeSummary = false) {
         let curRow: any;
-        if (this.grid.virtualizationState) {
-            curRow = this.grid.dataView[rowIndex - this.grid.virtualizationState.startIndex];
-        }else if (rowIndex < 0 || rowIndex > this.grid.dataView.length - 1) {
-            return false;
+
+        if (rowIndex < 0 || rowIndex > this.grid.dataView.length - 1) {
+                curRow = this.grid.dataView[rowIndex - this.grid.virtualizationState.startIndex];
+            if (!curRow){
+                return false;
+            }
         }else {
             curRow = this.grid.dataView[rowIndex];
         }

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

@@ -1029,10 +1029,7 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
      * @param index
      */
     public getRowByIndex(index: number): RowType {
-        if (this.gridAPI.grid.virtualizationState){
-            return this.createRow(index);
-        }
-        if (index < 0 || index >= this.dataView.length) {
+        if (index < 0) {
             return undefined;
         }
         return this.createRow(index);
@@ -1145,9 +1142,10 @@ export class IgxGridComponent extends IgxGridBaseDirective implements GridType,
         let row: RowType;
         let rec: any;
 
-        if (this.gridAPI.grid.virtualizationState) {
-            const virtIndex = index - this.gridAPI.grid.virtualizationState.startIndex;
-            rec = data ?? this.dataView[virtIndex];
+        if (index < 0 || index >= this.dataView.length) {
+            if (index >= this.dataView.length){
+                rec = data ?? this.gridAPI.get_row_by_index(index).rowData;
+            }
         }else {
             rec = data ?? this.dataView[index];
         }