Unauthorized user trying to login via Google Auth produces error

[jkleinsc]

Expected behavior:
When using google auth for login, if an unknown google user is selected the system should redirect to login.
Actual behavior:
An error screen is shown to the user
Steps to reproduce:
Make sure google auth is turned on
Try to login with a google email that doesn't have an account in hospitalrun
Screenshots (if applicable):

OS and Browser:
All