PUBAPI-838: Prevent exceptions when images haven't been imported before running tests.
PUBAPI-838: Prevent exceptions when images haven't been imported before running tests.

joyent/sdc-cloudapi,arekinath/sdc-cloudapi,joyent/sdc-cloudapi,KrisShannon/sdc-cloudapi,misterbisson/sdc-cloudapi,misterbisson/sdc-cloudapi,arekinath/sdc-cloudapi,KrisShannon/sdc-cloudapi