Can respond to friendship requests from memberships bar

lib/models/friend.dart

@@ -8,12 +8,12 @@ import 'package:meta/meta.dart';
 /// @author Pierre HUBERT
 
 class Friend extends CacheModel implements Comparable<Friend> {
-  final bool accepted;
+  bool accepted;
   final int lastActive;
   final bool following;
   final bool canPostTexts;
 
-  const Friend({
+  Friend({
     @required int id,
     @required this.accepted,
     @required this.lastActive,
@@ -22,6 +22,8 @@ class Friend extends CacheModel implements Comparable<Friend> {
   })  : assert(id != null),
         assert(accepted != null),
         assert(lastActive != null),
+        assert(following != null),
+        assert(canPostTexts != null),
         super(id: id);
 
   /// Check out whether friend is connected or not