Blank vhost for Rabbitmq Scaler apiHost is erroring out when making api calls to the queue.

Expected Behavior

With no vhost specified the api call to RabbitMQ should look like this:
http://guest:guest@rabbitmq:15672/api/queues/%2F/queuename

Actual Behavior

With no vhost specified the api call to RabbitMQ looks like this:
http://guest:guest@rabbitmq:15672/api/queues/api//queuename

Debug log from Controller:
{"level":"debug","ts":"2020-04-29T00:15:39.676Z","logger":"scalehandler","msg":"Error getting scale decision","ScaledObject.Namespace":"cust0-herald-test","ScaledObject.Name":"celery-scaledobject","ScaledObject.ScaleType":"deployment","Error":"error inspecting rabbitMQ: error requesting rabbitMQ API status: 404 Not Found, response: {"error":"Object Not Found","reason":"Not Found"}, from: http://guest:guest@rabbitmq.cust0-herald-test.svc.cluster.local:15672/api/queues/api//celery"}

Steps to Reproduce the Problem

1. Don't specify a vhost in the apiHost setting
2. Deploy scaledobject without vhost specified

Specifications

• KEDA Version: v1.4.1
• Kubernetes Version: v1.14.8
• Scaler(s): RabbitMQ