FR 2945715 - Improve Advanced Search

http://sourceforge.net/support/tracker.php?aid=2945715
- Implement fix for backward compatibility suggested by tspc

org.adempiere.base/src/org/compiere/model/MQuery.java

@@ -624,6 +624,9 @@ public class MQuery implements Serializable
 			qualified = false;
 		//
 		StringBuffer sb = new StringBuffer();
+		if (! isActive())
+			return sb.toString();
+		
 		sb.append('(');
 		for (int i = 0; i < m_list.size(); i++)
 		{