Garden fails with cryptic error msg when called outside of git repo

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Bug

Current Behavior

When calling Garden outside of an initialized git repository, it fails with a rather cryptic error message.

Expected behavior

A concise error message with an explanation as to why it fails.

Reproducible example

1. Run Garden outside of a Git repo (but all the right config files in place)
2. Run git init and do it again

Workaround

N/A

Suggested solution(s)

N/A

Additional context

N/A

Your environment

% garden version
0.10.9
% kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.3", GitCommit:"5e53fd6bc17c0dec8434817e69b04a25d8ae0ff0", GitTreeState:"clean", BuildDate:"2019-06-06T01:44:30Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"darwin/amd64"}
The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port?
% docker version
Client: Docker Engine - Community
Version: 19.03.0-rc2
API version: 1.40
Go version: go1.12.5
Git commit: f97efcc
Built: Wed Jun 5 01:37:53 2019
OS/Arch: darwin/amd64
Experimental: false
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

garden version

kubectl version

docker version