Bug 204229 [Automation][Regression]Exception is thrown when preview reportdesign in webviewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/util/ExprDataReader1.java
java.util.Iterator it = this.dataSetExprKeys.keySet( ).iterator( );
		while( it.hasNext( ))
		{
			String key = it.next( ).toString( );
			String value = (String)this.dataSetExprKeys.get( key );
			valueMap.put( key, this.dataSetData.getResultObject( ).getFieldValue( value ) );
		}
		return valueMap;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IExprResultReader#close()
	 */
	public void close( )
	{
		try
		{
			if ( rowExprsDis != null )
			{
				rowExprsDis.close( );
				rowExprsDis = null;
			}
		}
		catch ( IOException e )
		{
			
		}
	}
	
}