cleanup code

lib/domain/entities/user.dart

@@ -41,16 +41,10 @@ class User {
     }
   }
 
-  String get getUserUnseenCount => userUnseenCount != null
-      ? userUnseenCount > 100
-          ? "99+"
-          : userUnseenCount.toString()
-      : "0";
-  String get getFcsUnseenCount => fcsUnseenCount != null
-      ? fcsUnseenCount > 100
-          ? "99+"
-          : fcsUnseenCount.toString()
-      : "0";
+  String get getUserUnseenCount =>
+      userUnseenCount > 100 ? "99+" : userUnseenCount.toString();
+  String get getFcsUnseenCount =>
+      fcsUnseenCount > 100 ? "99+" : fcsUnseenCount.toString();
 
   List<String> privileges = [];
 
@@ -101,7 +95,8 @@ class User {
   }
 
   factory User.fromMap(Map<String, dynamic> map, String docID) {
-    var _date = (map['message_time'] as Timestamp);
+    var _date =
+        map['message_time'] == null ? null : (map['message_time'] as Timestamp);
 
     List<String> _privileges =
         map['privileges'] == null ? [] : map['privileges'].cast<String>();
@@ -127,7 +122,7 @@ class User {
   }
 
   bool isCustomer() {
-    return privileges == null || privileges.length == 0;
+    return privileges.length == 0;
   }
 
   bool hasSysAdmin() {
@@ -183,7 +178,7 @@ class User {
   }
 
   bool _has(String privilege) {
-    return (privileges != null ? privileges.contains(privilege) : false);
+    return (privileges.contains(privilege));
   }
 
   @override