Comments doesn't work from ?announcement=xx urls.

[wizzardking]

Comment section doesn't work if jump to a specific announcement.

If a user came to the Announcement Center from a sent mail or from dashboard widget, the comment sections won't open.

Steps to reproduce

1. open the announcement center by adding the id of the announcement: https://url.com/apps/announcementcenter?announcement=10
2. Click on the "Comments" Button

Expected behaviour

The comment section should be displayed

Actual behaviour

Nothing happend. Announcement Center has to get opend without ?announcementer=xx on the url.

Server configuration

Tested with NC 26 & 27 on several different server configurations.