TF-2907 Hide widget when corresponding event attribute is null

lib/features/email/presentation/extensions/calendar_event_extension.dart

@@ -110,7 +110,7 @@ extension CalendarEventExtension on CalendarEvent {
       case EventMethod.refresh:
       case EventMethod.cancel:
       case EventMethod.declineCounter:
-        return getOrganizerNameEvent(context);
+        return organizerName;
       case EventMethod.reply:
       case EventMethod.counter:
         return getAttendeeNameEvent(context, listEmailAddressSender);
@@ -119,8 +119,6 @@ extension CalendarEventExtension on CalendarEvent {
     }
   }
 
-  String getOrganizerNameEvent(BuildContext context) => organizer?.name ?? AppLocalizations.of(context).you;
-
   String get organizerName => organizer?.name ?? organizer?.mailto?.value ?? '';
 
   String getAttendeeNameEvent(BuildContext context, List<String> listEmailAddressSender) {

lib/features/email/presentation/extensions/list_attendee_extension.dart

@@ -11,9 +11,12 @@ extension ListAttendeeExtension on List<CalendarAttendee> {
       .join(', ');
   }
 
-  List<CalendarAttendee> withoutOrganizer(CalendarOrganizer organizer) {
-  return where((attendee) => attendee.mailto?.mailAddress != organizer.mailto)
-    .whereNotNull()
-    .toList();
+  List<CalendarAttendee> withoutOrganizer(CalendarOrganizer? organizer) {
+    if (organizer == null) {
+      return this;
+    }
+    return where((attendee) => attendee.mailto?.mailAddress != organizer.mailto)
+      .whereNotNull()
+      .toList();
   }
 }