From https://openedx.atlassian.net/browse/ECOM-4724
In http://course-catalog-api-guide.readthedocs.io/en/latest/:
Some of the fields were documented as returning an array of objects, but would only return a single instance:
o person.profile_image
o organization.logo_image
o course_runs.image
o course_runs.video
additional research is required, beyond the change from array to single instance.