[fixed] Another mission target convo bug - mantis 5684
[fixed] Double system message when accepting a destroy mission - mantis
5684

Change-Id: I21ae8b9f4e45d77ab02b6ae4e3bbde655c360d36
Merge "[fixed] Another mission target convo bug - mantis 5684 [fixed] Double system message when accepting a destroy mission - mantis 5684" into unstable