Today if you remove the location currently viewed in the admin, you can have a 404
example:
Go to /admin/Oslo_Skyline.png
Add a location for Oslo_Skyline.png, for instance Projects
Then go to admin/Projects/Oslo_Skyline.png (you can do this if you browse with the UDW, not if you browse through the regular content navigation yet)
Then go to Navigation subtap and remove the location, admin UI will go in 404.
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Delete the location currently viewed

Given I have multiple locations in the ‘Content locations' table
When I select the current location
Then the delete button in the table header is enabled

Given the delete button in the table header is enabled
When I click the delete button
Then I see a modal window to confirm the deletion
And on Confirmation, I am redirected to the main location
And on Cancel, the modal window closes