Ibrahim Serdar Acikgoz

#### Summary Looks like a trivial issue due to a forgotten `nil` check. #### Ticket Link https://mattermost.atlassian.net/browse/MM-60278 #### Release Note ```release-note NONE ```

[MM-60083] export: do not export DMs/GMs if users are deleted

1

#### Summary A separate PR will accommodate this one to convert DMs/GMs to private channel if any of the users are deleted. For now, to keep things simple and straight...

[MM-48092] Allow importing bots without users

3

#### Summary The bots should still be importable if the owner is not specified, I don't see any reason to abort a import process because of this. Another reason this...