reply_to_pk not updated ok for deleted messages
I have a conversetion of 3 messages for example. If I delete the last message only, that one will go to Trash. After that if I want to see that conversation I can still see that deleted message. This is not a problem, and I can color it differently too. The problem is if I want to reply to that conversation when the last message is in Trash I will receive a not-found error :d.