AW-3912 fix build

projects/common/src/fm/services/item.service.ts

@@ -84,7 +84,7 @@ export class ItemService {
   }
 
   getChildItemList(parentcode: string, itemType: string, dataFilter?: any, level: number = 1, deep: boolean = true,
-                   startDate?: Date = null, endDate?: Date = null): Observable<IItem[]> {
+                   startDate?: Date, endDate?: Date): Observable<IItem[]> {
     var params = new HttpParams();
     if(itemType != null) {
       params = params.append("it", itemType);