when using redis caching deleted branches prevent builds

[scottillogical]

If you delete a branch, and it will break subsequent builds as it fails to pull down the

Identity added: /tmp/git-resource-private-key (/tmp/git-resource-private-key)
someshaw:somebranch
Cloning: git clone --single-branch  REDACTED --branch somebranch /tmp/build/get
Cloning into '/tmp/build/get'...
warning: Could not find remote branch somebranch to clone.
fatal: Remote branch somebranch not found in upstream origin