cleanup code

lib/data/provider/user_data_provider.dart

@@ -53,7 +53,7 @@ class UserDataProvider {
   }
 
   Future<List<User>> searchUser(String term) async {
-    if (term == null || term == '') return [];
+    if (term == '') return [];
 
     var bytes = utf8.encode(term);
     var base64Str = base64.encode(bytes);