Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
}
		if ( !isExpressionOK( ) )
		{
			return false;
		}
		return checkValues( );
	}
	/**
	 * Gets if the values of the condition is(are) available.
	 */
	protected boolean checkValues( )
	{
		if ( valueVisible == 3 )
		{
			if ( valueList.size( ) <= 0 )
			{
				return false;
			}
			else
			{
				return true;
			}
		}
		else
		{
			assert ( !expressionValue1.isDisposed( ) );
			assert ( !expressionValue2.isDisposed( ) );
			if ( expressionValue1.getVisible( ) )
			{
				if ( expressionValue1.getText( ) == null