fix: TT-279 Fix the comparison if var is null

Author: jase156

src/app/modules/shared/pipes/substract-date/substract-date.pipe.ts

@@ -44,7 +44,7 @@ export class SubstractDatePipe implements PipeTransform {
 
   transformInMinutes(fromDate: Date, substractDate: Date): number{
 
-    if (fromDate === null || substractDate === null) {
+    if (!fromDate || !substractDate) {
       return 0;
     }
 

src/app/modules/time-entries/components/calendar/calendar.component.ts

@@ -53,7 +53,7 @@ export class CalendarComponent implements OnInit {
       map((timeEntriesDatasorce) => timeEntriesDatasorce.data.map(
           (timeEntries) => ({
               start: new Date(timeEntries.start_date),
-              end: timeEntries.end_date === null ? null : new Date(timeEntries.end_date),
+              end: timeEntries.end_date ? new Date(timeEntries.end_date) : null ,
               title: timeEntries.description,
               id: timeEntries.id,
               meta: timeEntries
@@ -105,7 +105,7 @@ export class CalendarComponent implements OnInit {
   }
 
   getTimeWork(startDate: Date, endDate: Date): number{
-    if (endDate === null){
+    if (!endDate){
       return 30;
     }
     return new SubstractDatePipe().transformInMinutes( endDate , startDate);