MONDRIAN-847: Should not have thrown an exception but silently discar…

…ded the function call.

[git-p4: depot-paths = "//open/mondrian-release/3.2/": change = 14010]

src/main/mondrian/rolap/RolapNamedSetEvaluator.java

@@ -302,7 +302,7 @@ public int previousIndex() {
                 }
 
                 public void set(T o) {
-                    throw new UnsupportedOperationException();
+                    // no op.
                 }
 
                 public void remove() {