MONDRIAN: The olap4j driver must return a transaction isolation of TR…

…ANSACTION_NONE

[git-p4: depot-paths = "//open/mondrian-release/3.2/": change = 13809]

src/main/mondrian/olap4j/MondrianOlap4jConnection.java

@@ -214,7 +214,7 @@ public void setTransactionIsolation(int level) throws SQLException {
     }
 
     public int getTransactionIsolation() throws SQLException {
-        throw new UnsupportedOperationException();
+        return TRANSACTION_NONE;
     }
 
     public SQLWarning getWarnings() throws SQLException {