https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-1070: Support alternative storage of provider logos
https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-1070: Support alternative storage of provider logos
https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-1070: Support alternative storage of provider logos
fixed handling of placeholder icon
use correct institution id
Merge remote-tracking branch 'origin/DDBNEXT-1070' into develop

Conflicts:
	grails-app/services/de/ddb/next/ItemService.groovy