Disabling the oculus rift plugin but no the Oculus input or Oculus Library will cause a crash

If the user disables the oculus rift plugin without disabling the oculus input and oculus library plugins the project will crash on opening.

1. Open the Editor
2. Disable the oculus rift plug in (Do not disable the oculus input or oculus library)
3. Click save and restart
4. Notice that the editor crashes when it tries to open back up

Crash after update from 4.10 preview 2 to preview 3