"My Files" view improperly builds breadcrumb

The default action for the "Owner" contextual filter of the supplied "Files" View under user/%/my-files is set to "empty". This causes a Views quirk to appear when generating the breadcrumb (see: https://drupal.org/comment/8548197).

Instead of the breadcrumb showing as:

Home (/) > User (/user) > Files (/user/{uid}/my-files)

it's showing as:

Home (/) > User (/user) > Files (/user/all/my-files) > Files (/user/{uid}/my-files)

It's difficult to tell whether or not this is intended behaviour in Views, or a bug. However, it's easy to workaround by changing the default action on the contextual filter from "empty" to "not found". This avoids the Views issue, and is probably more appropriate anyway.