Bug 135778 There is an error when the data item has no binding data set
Data item can have no binding data set, if it happens, it indicates it only use the basic Java Script function such as new Date(). At this moment, the data of data item is not stored in report document by DtE, which only supports these data items which has binding data set.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedDummyQuery.java
{
		private IQueryResults queryResults;
		private ExprManager exprManager;
		private Scriptable queryScope;
		private final static int NOT_START = 0;
		private final static int IN_ROW = 1;
		private final static int ENDED = 2;
		private int openStatus = NOT_START;
		/**
		 * @throws BirtException
		 */
		private void checkOpened( ) throws BirtException
		{
			if ( openStatus != IN_ROW )
				throw new DataException( "" );
		}
		/**