If configured branch didn't exist at first launch, flux won't find it later

[yellowmegaman]

Describe the bug
When pointing flux on non-existing (yet) branch in git, it will say branch "does not exist", even if branch is created after that. Have to manually kill flux pod.

To Reproduce
Steps to reproduce the behaviour:

1. GKE cluster + flux + github
2. Launch flux
3. point it to repo A branch A
4. it will say "does not exist"
5. create that branch
6. still get error until delete flux pod to restart.

Expected behavior
Flux should just work with created branch

Logs

2019-08-16 14:53:24.025 MSK
ts=2019-08-16T11:53:24.024322937Z caller=loop.go:85 component=sync-loop err="git repo not ready: configured branch 'killpinbug' does not exist"
2019-08-16 14:56:24.025 MSK
ts=2019-08-16T11:56:24.025343062Z caller=loop.go:85 component=sync-loop err="git repo not ready: configured branch 'killpinbug' does not exist"

Additional context
Add any other context about the problem here, e.g

• Flux version: 1.13.1
• Kubernetes version: 1.13.7-gke.8
• Git provider: github
• Container registry provider: gcr.io

[yellowmegaman]

That was fast 🥇
Thank you! Hope it will make it's way in some release soon