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
{
		Scriptable root = scriptContext.getRootScope( );
		Object sObj = Context.javaToJS( value, root );
		root.put( name, root, sObj );
	}
	/**
	 * Evaluate a BIRT expression
	 * 
	 * @param source
	 *            the expression to be evaluated
	 * @return the result if no error exists, otherwise null.
	 * 
	 * @see evaluate(String,String,int)
	 */
	public Object evaluate( String source )
	{
		return evaluate( source, "<inline>", 1 );
	}
	/**
	 * @param jsValue
	 *            a Javascript object
	 * @return A Java object
	 */
	public Object jsToJava( Object jsValue )
	{
		return scriptContext.jsToJava( jsValue );
	}
	/**
	 * Evaluate a BIRT expression
	 *