fix(llc): Fix Filter.empty encoding

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat/CHANGELOG.md

@@ -19,6 +19,7 @@
 🐞 Fixed
 
 - [[#659]](https://github.com/GetStream/stream-chat-flutter/issues/659) Fixed unread count not updating correctly.
+- Fix `Filter.empty()` json encoding.
 
 ## 2.2.1
 

packages/stream_chat/lib/src/core/models/filter.dart

@@ -104,7 +104,7 @@ class Filter extends Equatable {
 
   /// An empty filter
   const Filter.empty()
-      : value = const {},
+      : value = const <String, Object?>{},
         operator = null,
         key = null;
 

packages/stream_chat/test/src/core/models/filter_test.dart

@@ -226,6 +226,12 @@ void main() {
           json.encode(value),
         );
       });
+
+      test('empty', () {
+        const filter = Filter.empty();
+        final encoded = json.encode(filter);
+        expect(encoded, '{}');
+      });
     });
 
     test('groupedFilter', () {