Description:

If you use the use the prune message feature as is often done in #sandbox on open.rocket.chat. All threads are orphaned with no way to access them. But they are still around.

Steps to reproduce:

1. Start a thread
2. Copy url of the thread
3. Prune messages in a range that includes the message that you started a thread from
4. look at threads list its empty.
5. paste thread url back in

Expected behavior:

Thread should either go away... or still be viewable in threads list

Server Setup Information:

• Version of Rocket.Chat Server: current commit ( open.rocket.chat )