The `stop_review` job fails because it tries to fetch the removed branch

Job #78860746 failed for 9c3a5b0a.

Running with gitlab-runner 11.0.0 (5396d320)
  on docker-auto-scale 72989761
Using Docker executor with image registry.gitlab.com/charts/gitlab:latest ...
Pulling docker image registry.gitlab.com/charts/gitlab:latest ...
Using docker image sha256:bbd4fce82bebe71758c40210fcc745cdcdcdadaf7dacad6194bc7c4010c9e141 for registry.gitlab.com/charts/gitlab:latest ...
Running on runner-72989761-project-278964-concurrent-0 via runner-72989761-srm-1530549743-81ad192b...
Cloning repository for add-review-apps with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ee'...
warning: Could not find remote branch add-review-apps to clone.
fatal: Remote branch add-review-apps not found in upstream origin
Cloning repository for add-review-apps with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ee'...
warning: Could not find remote branch add-review-apps to clone.
fatal: Remote branch add-review-apps not found in upstream origin
Cloning repository for add-review-apps with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ee'...
warning: Could not find remote branch add-review-apps to clone.
fatal: Remote branch add-review-apps not found in upstream origin
ERROR: Job failed: exit code 1

This job is using GIT_CHECKOUT: "false" but we should be using GIT_STRATEGY: none. /cc @marin