Adds ForgivingProjectDataSource #140
Merged
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This PR introduces ForgivingProjectDataSource which returns an empty set of projects when we fail to fetch the user's access token.
These changes are introduced to improve our support for guest users. When a guest user is incorrectly configured to have access to a non-existing repository, we will not be able to create their access token as it is tied to a list of repositories. Therefore we regard the user as having access to no repositories when we fail to obtain their access token.
This logic is in theory applied for host users, i.e. GitHub users too, however, we have other logic in place to ensure that we have a valid access token for those users before they are even allowed to login. This is not the case for guest users as that could prevent them from logging in when they are configured to have access to non-existing repositories.