Bug 32307: (follow-up) Fix gallery when Coce is enabled

Bug 32307: (follow-up) Fix gallery when Coce is enabled

Yet another fix, this is porting the following change to the intranet:
  commit 1916c644808577beb3170d642f93b456bfcc5c56
  Bug 28180: Fix bug with first image does not exist

To recreate the problem:
Enable Coce
Go to biblionmber=5 detail
=> No image (but one is displayed on the search result)
Add a local cover image
=> Only the local cover image is displayed
Apply this patch
=> Both images are displayed
Remove the local cover image
=> Image from coce is displayed

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>