Comment 3 for bug 1780332

Deployed with the fix and got error below from vault.

juju status:
vault/0 error idle 5/lxd/5 10.216.5.56 8200/tcp hook failed: "update-status"

juju log:
2018-07-06 00:05:39 INFO juju-log Invoking reactive handler: reactive/vault_handlers.py:482:prime_assess_status
2018-07-06 00:05:39 DEBUG update-status active
2018-07-06 00:05:39 DEBUG update-status Traceback (most recent call last):
2018-07-06 00:05:39 DEBUG update-status File "/var/lib/juju/agents/unit-vault-0/charm/hooks/update-status", line 19, in <module>
2018-07-06 00:05:39 DEBUG update-status main()
2018-07-06 00:05:39 DEBUG update-status File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.5/site-packages/charms/reactive/__init__.py", line 82, in main
2018-07-06 00:05:39 DEBUG update-status hookenv._run_atexit()
2018-07-06 00:05:39 DEBUG update-status File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.5/site-packages/charmhelpers/core/hookenv.py", line 1128, in _run_atexit
2018-07-06 00:05:39 DEBUG update-status callback(*args, **kwargs)
2018-07-06 00:05:39 DEBUG update-status File "/var/lib/juju/agents/unit-vault-0/charm/reactive/vault_handlers.py", line 585, in _assess_status
2018-07-06 00:05:39 DEBUG update-status application_version_set(health.get('version'))
2018-07-06 00:05:39 DEBUG update-status File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.5/site-packages/charmhelpers/core/hookenv.py", line 970, in application_version_set
2018-07-06 00:05:39 DEBUG update-status subprocess.check_call(cmd)
2018-07-06 00:05:39 DEBUG update-status File "/usr/lib/python3.5/subprocess.py", line 576, in check_call
2018-07-06 00:05:39 DEBUG update-status retcode = call(*popenargs, **kwargs)
2018-07-06 00:05:39 DEBUG update-status File "/usr/lib/python3.5/subprocess.py", line 557, in call
2018-07-06 00:05:39 DEBUG update-status with Popen(*popenargs, **kwargs) as p:
2018-07-06 00:05:39 DEBUG update-status File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
2018-07-06 00:05:39 DEBUG update-status restore_signals, start_new_session)
2018-07-06 00:05:39 DEBUG update-status File "/usr/lib/python3.5/subprocess.py", line 1490, in _execute_child
2018-07-06 00:05:39 DEBUG update-status restore_signals, start_new_session, preexec_fn)
2018-07-06 00:05:39 DEBUG update-status TypeError: Can't convert 'NoneType' object to str implicitly
2018-07-06 00:05:39 ERROR juju.worker.uniter.operation runhook.go:113 hook "update-status" failed: exit status 1