Tenant create fails if tenant already exists

[Akkuma]

• I'm submitting a ...
  [X] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary
  The docs say If the tenant is already created: will return 200 instead of 201, and will return the existing tenant object in the response body.. However this is throwing an error without a try/catch:

	try {
		tenant = await permit.api.tenants.get(tenantKey)
	} catch(e) {
		tenant = await permit.api.tenants.create({ key: tenantKey, name: sender.tenant.name })
	}

• Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)