Campaign component template uses slot UUID, not slot name

Steps to reproduce

1.  Add a managed campaign to a page and select a slot with no available campaign.

Expected results

# The template should show a message "No campaign found for SLOTNAME" where SLOTNAME is the name of the slot selected above.

Actual results

1. As shown in the attachment, the message says "No campaign found for SLOTID" where SLOTID is the UUID of the chosen slot, not the name.