https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-25: further work on item hierarchy
https://jira.deutsche-digitale-bibliothek.de/browse/DDBNEXT-25: further work on item hierarchy
reformatted
layout fix
Merge branch 'develop' into DDBNEXT25-2
optimized check for leaf node
Merge remote-tracking branch 'origin/DDBNEXT25-2' into develop