message: Fix: Reference to null object error in matrix-rubric in preview page because of "paneldynamic"
diff: @@ -149,6 +149,7 @@ export class MartrixCells {
  return this.cellsOwner ? this.cellsOwner.getColumns() : [];
  }
  private getCellRowColumnValue(val: any, values: Array<any>): any {
  + if (val === null || val === undefined) return null;
  if (typeof val == "number") {
  if (val < 0 || val >= values.length) return null;
  val = values[val].value;
  