* Removing obsolete string.format calls. * FeatureBasedMapData cannot have null elements on Features property. ** Removed defensive programming that covered this usecase. * cleanup Related to Issue [WTI-507] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@4751 5a3db67b-de53-47b5-99c8-a1c30a6650e2