Minor change after datamodel update

vospace-ui-backend/src/main/java/it/inaf/ia2/vospace/ui/service/NodeInfo.java

@@ -59,8 +59,8 @@ public class NodeInfo {
     }
 
     private Optional<String> getProperty(Node node, String uri) {
-        if (node.getProperties() != null && node.getProperties().getProperty() != null) {
-            for (Property property : node.getProperties().getProperty()) {
+        if (node.getProperties() != null && node.getProperties() != null) {
+            for (Property property : node.getProperties()) {
                 if (uri.equals(property.getUri())) {
                     return Optional.of(property.getValue());
                 }