Merge pull request #1764 from morguldir/morguldir/accept-unset-presence

Don't fail sync if a presence event contains an empty presence field

lib/matrix_api_lite/model/presence_content.dart

@@ -31,7 +31,8 @@ class PresenceContent {
 
   PresenceContent.fromJson(Map<String, Object?> json)
       : presence = PresenceType.values.firstWhere(
-            (p) => p.toString().split('.').last == json['presence']),
+            (p) => p.toString().split('.').last == json['presence'],
+            orElse: () => PresenceType.offline),
         lastActiveAgo = json.tryGet<int>('last_active_ago'),
         statusMsg = json.tryGet<String>('status_msg'),
         currentlyActive = json.tryGet<bool>('currently_active');