RM-2113. Acting on review comments.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/modules/recordsmanagement/HEAD@103781 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/UserQueryParams.java

@@ -101,7 +101,14 @@ public final class UserQueryParams
 
         if (otherElems != null)
         {
-            elementList.addAll(asList(otherElems));
+            final List<T> tList = asList(otherElems);
+            final int firstNull = tList.indexOf(null);
+            if (firstNull != -1)
+            {
+                // "+ 2" so that position 1 points to 'firstElem' and so on through otherElems.
+                throw new IllegalArgumentException("Unexpected null element at position " + firstNull + 2);
+            }
+            elementList.addAll(tList);
         }
 
         return elementList;