Bug 209126 DataException throws out when set highlight condition in sub-report[0302]
Description: Set highlight condition in sub-report, when "select value..." in the highlight dialog, DataException throws out. Build version:2.3.0.v20071108-0800 Steps to reproduce: 1.Get the attached report design file, which contains a sub-report. 2.Select the inner table, and then go to "highlight" tab in the property editor view to set a highlight rule. When click "select value...", DataException throws out. Error: The expression's value can not be retrieved. An error happened in data type conversion. Can not convert the value of org.eclipse.birt.data.engine.script.DataExceptionMocker@79c17b to Integer type.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/HighlightRuleBuilder.java
IChoice ci = cs.findChoiceByDisplayName( ftName );
		if ( ci != null )
		{
			return ci.getName( );
		}
		if ( SYSTEM_FONT_LIST != null && SYSTEM_FONT_LIST.length > 0 )
		{
			for ( int i = 0; i < SYSTEM_FONT_LIST.length; i++ )
			{
				if ( SYSTEM_FONT_LIST[i].equals( ftName ) )
				{
					
					return ftName;
				}
			}
		}
		return null;
	}
	private int getFontSize( )
	{
		String rfs = getRawFontSize( );
		if ( rfs == null && designHandle != null )
		{
			if ( designHandle instanceof StyleHandle )
			{
				rfs = ( (StyleHandle) designHandle ).getFontSize( )
						.getStringValue( );
			}
			else
			{