[BUG] dash should not lists PRs on archived repositories

[obourgain]

Describe the bug Dash lists the PRs on archived repos. I can't change those PRs, even not close them. I don't have the rights to unarchive the repos, so I just have zombies PRs in the list.

To Reproduce Steps to reproduce the behavior:

1. Create a repo
2. Create a PR on it
3. Dash lists the repo
4. Archive the repo
5. Dash stills display the PR

Expected behavior PRs on archived repos should be ignored.

Desktop (please complete the following information):

• OS: OSX