Show release evidence even if user doesn't have access to issues

Problem

As part of e9dc8322 we implemented 2 fixes:

1. we remove issues from the release evidence hash on the fly
2. we don't allow users to download release evidence if they don't have access to issues.

One of these would be enough. And the second fix actually make life of some users worse: they can't download release evidence even though it doesn't contain any information they don't have access to.

Proposal

Allow users to download release evidence even if they don't have access to issues.