Exiting SteamVR while vr-previewing causes editor to stop rendering correctly

see webm video below

1. Open a Project
   1. Ensure SteamVR is Running/Connected to vive
2. VR-Preview
3. Alt+Tab to bring up the non-vr-preview editor window.
4. Exit out of SteamVR
5. Exit the VR-Preview window
6. attempt to interact with the editor.

Result: UE4 Editor because unresponsive / not render correctly
Expect: The Editor to gracefully close VR-Preview and return to normal editor

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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