Fixes bug not saving or updating the "Uri" value on a Dataset Description.

dmp-backend/data/src/main/java/eu/eudat/data/entities/Dataset.java

@@ -285,6 +285,7 @@ public class Dataset implements DataEntity<Dataset, UUID> {
 				return item;
 			}).collect(Collectors.toList()));
 		}
+		this.setUri(entity.getUri());
 		this.setDescription(entity.getDescription());
 		this.setLabel(entity.getLabel());
 		this.setProperties(entity.getProperties());