Merge branch 'fix-mentions' into 'develop'

Fix mentions

Closes #1449

See merge request soapbox-pub/soapbox!2584

app/soapbox/reducers/notifications.ts

@@ -93,7 +93,7 @@ const isValid = (notification: APIEntity) => {
     }
 
     // Mastodon can return status notifications with a null status
-    if (['mention', 'reblog', 'favourite', 'poll', 'status'].includes(notification.type) && !notification.status.id) {
+    if (['mention', 'reblog', 'favourite', 'poll', 'status'].includes(notification.type) && !notification.getIn(['status', 'id'])) {
       return false;
     }