Bug 121111 Bad event handler class name does not cause an error
Open a report design, open any Data Set's Property editor. Type in an invalid Java class name for the "Event Handler Class" property, say "aaa". Preview a report that uses that Data Set. The report executes normally. No error is shown. Event handlers are an integral part of a report design, and if a script handler class is not found, or if the handler throws a runtime exception, Report Engine should either stop the report execution, or show the error message in the generated report. (Tested with the 2005-12-15 nightly build)
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
ReportItemDesign design = null;
		if ( content != null )
			design = (ReportItemDesign) content.getGenerateBy( );
		DesignElementHandle handle = design == null ? null : design.getHandle( );
		addException( handle, ex );
	}
	protected HashMap elementExceptions = new HashMap( );
	public void addException( DesignElementHandle element, BirtException ex )
	{
		ElementExceptionInfo exInfo = (ElementExceptionInfo) elementExceptions
				.get( element );
		if ( exInfo == null )
		{
			exInfo = new ElementExceptionInfo( element );
			if ( reportContent != null )
				reportContent.getErrors( ).add( exInfo );
			elementExceptions.put( element, exInfo );
		}
		exInfo.addException( ex );
	}
	/**
	 * report object is the script object used in the script context.
	 * 
	 * All infos can get from this object.
	 * 
	 * 
	 */
	private class ReportObject
	{
		/**