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
* get the report design handle
		 * 
		 * @return report design object.
		 */
		public Object getDesign( )
		{
			return scriptContext.eval( "design" );
		}
		/**
		 * get the report document.
		 * 
		 * @return report document.
		 */
		public Object getDocument( )
		{
			return reportDoc;
		}
		/**
		 * @return a map of name/value pairs for all the parameters and their
		 *         values
		 */
		public Map getParams( )
		{
			return params;
		}
		/**
		 * @return a set of data sets
		 */
		public Object getDataSets( )
		{