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/api/impl/RunTask.java
*            the report runnable instance
	 */
	public RunTask( ReportEngine engine, IReportRunnable runnable )
	{
		super( engine, runnable );
		executionContext.setFactoryMode( true );
		executionContext.setPresentationMode( false );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.IRunTask#setPageHandler(org.eclipse.birt.report.engine.api.IPageHandler)
	 */
	public void setPageHandler( IPageHandler callback )
	{
		this.pageHandler = callback;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.IRunTask#run(java.lang.String)
	 */
	public void run( String reportDocName ) throws EngineException
	{
		if ( reportDocName == null || reportDocName.length( ) == 0 )
			throw new EngineException(
					"Report document name is not specified when running a report." ); 
		try
		{
			archive = new FileArchiveWriter( reportDocName );