Comment 8 for bug 1750527

The specific issue here around snapd safely displaying arbitrary description has been fixed, so I'm closing this task, but I think that we should possibly also have another new bug/task for snapd in validating the description field, etc. from `snap pack` so that for snap authors that have mistakes or errors in their snap yaml, they see the error immediately from snapcraft instead of pushing it to the store and seeing it fail from the review-tools check, but I will file another bug for that.