removed import for "Optional" class which is only availablle since java 8
removed import for "Optional" class which is only availablle since java 8

korpling/ANNIS,amir-zeldes/ANNIS,zangsir/ANNIS,zangsir/ANNIS,korpling/ANNIS,zangsir/ANNIS,zangsir/ANNIS,zangsir/ANNIS,zangsir/ANNIS,amir-zeldes/ANNIS,amir-zeldes/ANNIS,amir-zeldes/ANNIS,korpling/ANNIS,amir-zeldes/ANNIS,korpling/ANNIS,korpling/ANNIS,amir-zeldes/ANNIS