intermediate

app/lib/data/models/equatable_iterable.dart

@@ -6,7 +6,7 @@ class EquatableCollection<T> with FastEquatable {
 
   EquatableCollection(this.collection, {required this.immutable})
       : assert(
-          collection is Map || collection is Iterable,
+          collection is Map || collection is Iterable || collection == null,
           'Collection type not supported',
         );
 

app/lib/data/models/web_page_info.dart

@@ -9,9 +9,12 @@ class WebPageInfo {
   final String? title;
   final BrowserIcon? favicon;
 
+  bool get isPageInfoComplete =>
+      (title?.isNotEmpty ?? false) && favicon != null;
+
   WebPageInfo({
     required this.url,
-    required this.title,
-    required this.favicon,
+    this.title,
+    this.favicon,
   });
 }