Guard against deleted project feature entry
In https://gitlab.com/gitlab-org/gitlab-ce/issues/66482, we see that a
project's project_feature association may be lazily loaded and hence
return nil if the entry is deleted if the Project is already loaded
in memory. To ensure we don't fail hard when this happens, assume all
features are disabled.
We can fix this issue by eager loading the project_feature in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32169, but we
shouldn't have to depend on that.
Edited by Stan Hu