polish llc

packages/stream_chat/lib/src/client.dart

@@ -481,7 +481,7 @@ class StreamChatClient {
       _connectionId = event.connectionId;
     }
 
-    if (!event.isLocal!) {
+    if (!event.isLocal) {
       final createdAt = event.createdAt;
       if (_synced && createdAt != null) {
         await _chatPersistenceClient?.updateConnectionInfo(event);

packages/stream_chat/lib/src/models/event.dart

@@ -88,7 +88,7 @@ class Event {
   final String? parentId;
 
   /// True if the event is generated by this client
-  bool? isLocal;
+  late final bool isLocal;
 
   /// Map of custom channel extraData
   @JsonKey(includeIfNull: false)