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/data/dte/DteDataEngine.java
}
		assert ( false );
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.data.IDataEngine#close()
	 */
	public void close( )
	{
		assert ( rsStack.size( ) > 0 );
		rsStack.removeLast( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.data.IDataEngine#shutdown()
	 */
	public void shutdown( )
	{
		assert ( rsStack.size( ) == 0 );
		engine.shutdown( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.data.IDataEngine#evaluate(org.eclipse.birt.data.engine.api.IExpression)
	 */
	public Object evaluate( IBaseExpression expr )