User 2648 tried to delete their user data, but received an internal server error (corresponding GlitchTip issue: https://glitchtip-wikipedialibrary.wmflabs.org/organizations/the-wikipedia-library/issues/458).
The application in question is 15442, which is an Invalid marked application. It looks like when we retrieve a users applications for blanking, we aren't including Invalid applications, which are excluded by default. We should possibly be using include_invalid here.