Description of problem:
=======================
On host events, there are redundant empty brackets after known host status

e.g Host master-0-2: updated status from "pending-for-input" to "known" ()


Version-Release number of selected component:
=============================================
Release tag
v1.0.7
Assisted Installer UI version
quay.io/ocpmetal/ocp-metal-ui:521cd8e4e07dc3aff5dd48bca8cbca0ae3244c8a
Assisted Installer
quay.io/ocpmetal/assisted-installer:a35669b4b093f15d943dbacc41f9d2a7b5652e0d
Assisted Installer Controller
quay.io/ocpmetal/assisted-installer-controller:a35669b4b093f15d943dbacc41f9d2a7b5652e0d
Assisted Installer Service
quay.io/ocpmetal/bm-inventory:d2f0c36e21438aac031231e7bcb72b8e302ab19e
Discovery Agent
quay.io/ocpmetal/agent:7fbd9c25093ab6699541f57c5e8535a01f320bf6
Ignition Manifests and Kubeconfig Generate
quay.io/ocpmetal/ignition-manifests-and-kubeconfig-generate:372f10d66357fd805df2b708f9881dd03c0cddb6
Image Builder
quay.io/ocpmetal/installer-image-build:196bcb0da115178e40b524b909627bb350cbfab6


How reproducible:
=================
100%


Steps to Reproduce:
===================
1. Download and boot from ISO   
2. Select the right role
3. Enter api vip and ingress vip
4. View Host Events


Actual results:
===============
On host events, there are redundant empty brackets after known host status

e.g Host master-0-2: updated status from "pending-for-input" to "known" ()


Expected results:
=================
If there is no text on brackets, they should deleted

Additional info: