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/GetParameterDefinitionTask.java
{
			return null;
		}
		return evaluate( expr, parameter.getDataType( ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.IGetParameterDefinitionTask#getSelectionChoice(java.lang.String)
	 */
	public Collection getSelectionList( String name )
	{
		usingParameterValues( );
		ReportDesignHandle report = ( ReportDesignHandle ) this.runnable
				.getDesignHandle( );
		ScalarParameterHandle parameter = ( ScalarParameterHandle ) report
				.findParameter( name );
		if ( parameter == null )
		{
			return Collections.EMPTY_LIST;
		}
		String selectionType = parameter.getValueType( );
		String dataType = parameter.getDataType( );
		boolean fixedOrder = parameter.isFixedOrder( );
		if ( DesignChoiceConstants.PARAM_VALUE_TYPE_DYNAMIC
				.equals( selectionType ) )
		{
			String dataSetName = parameter.getDataSetName( );
			String valueExpr = parameter.getValueExpr( );
			String labelExpr = parameter.getLabelExpr( );