model is properly defined in rest response

rest-api/src/main/java/lcsb/mapviewer/api/projects/comments/CommentRestImpl.java

@@ -119,7 +119,7 @@ public class CommentRestImpl extends BaseRestImpl {
       } else if (column.equals("elementid")) {
         value = getId(comment);
       } else if (column.equals("modelid")) {
-        value = comment.getModelData().getId();
+        value = comment.getSubmodelData().getId();
       } else if (column.equals("title")) {
         value = getTitle(comment);
       } else if (column.equals("pinned")) {