V2 teams API route can sometimes not return an owner

[ThatGravyBoat]

Describe the bug

The v2 api route can sometimes not return an owner which can cause issues due as previously standardized that there would be an owner.

https://github.com/modrinth/labrinth/blob/master/src/models/v2/teams.rs#L30

Steps to reproduce

No response

Expected behavior

No response

Additional context

No response