Fix projects without repo and wiki

When repo and wiki are disabled for a project, we're showing issues so we'll need to set @issuable_meta_data otherwise it would be giving nil errors. See:

https://sentry.gitlap.com/gitlab/staginggitlabcom/issues/23106/

@felipe_artur Please help review, thanks!

/cc @smcgivern @twk3

Closes #29542 (closed)