Editor build bugs

[danhalson]

Laura Holborrow has been experiencing some editor build failures; https://editor-api.raspberrypi.org/admin/good_job/jobs/074e7bc2-a8a1-4cb3-b7ac-56c5fcfaf804?locale=en and https://editor-api.raspberrypi.org/admin/good_job/jobs/95ac4bb0-6754-4d84-aa71-7ac490c16c2a?locale=en

Identify the issues and fix.

[create-issue-branch]

Branch issues/496-Editor_build_bugs created!