fix: Fix analysis issues

packages/flutter_widgets/lib/src/message_search_list_view.dart

@@ -1,5 +1,3 @@
-import 'dart:convert';
-
 import 'package:flutter/material.dart';
 import 'package:stream_chat/stream_chat.dart';
 import 'package:stream_chat_flutter/src/info_tile.dart';

packages/flutter_widgets/lib/src/user_list_view.dart

@@ -1,5 +1,3 @@
-import 'dart:convert';
-
 import 'package:flutter/material.dart';
 import 'package:stream_chat/stream_chat.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
@@ -252,7 +250,6 @@ class _UserListViewState extends State<UserListView>
       return widget.emptyBuilder(context);
     }
 
-    if (widget.emptyBuilder == null) {
     return LayoutBuilder(
       builder: (context, viewportConstraints) {
         return SingleChildScrollView(
@@ -269,7 +266,6 @@ class _UserListViewState extends State<UserListView>
       },
     );
   }
-  }
 
   Widget _buildListView(
     List<ListItem> items,