add configurable visual indicators per item in browse and search results
fix compilation error after changes in master
fix comments and typos
fix issues and recommendations based on @zuki @lap82 comments
check for null values (in order to avoid NPEs due to incorrect configuration)
Merge pull request #707 from EKT/DS-2162

DS-2162: Per item configurable visual indicators for browse and search results (JSPUI only)