If minikube isn't found on the path, don't fail the config
import subprocess
try:
minikube_ip = subprocess.check_output(['minikube', 'ip']).decode('utf-8').strip()
-except subprocess.SubprocessError:
+except (subprocess.SubprocessError, FileNotFoundError):
minikube_ip = '192.168.1.100'
c.BinderHub.hub_url = 'http://{}:30123'.format(minikube_ip)
