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/ScriptedDesignVisitor.java
} else if ( handle instanceof GridHandle )
		{
			GridScriptExecutor.handleOnPrepare( ( GridHandle ) handle,
					executionContext );
		} else if ( handle instanceof ImageHandle )
		{
			ImageScriptExecutor.handleOnPrepare( ( ImageHandle ) handle,
					executionContext );
		} else if ( handle instanceof LabelHandle )
		{
			LabelScriptExecutor.handleOnPrepare( ( LabelHandle ) handle,
					executionContext );
		} else if ( handle instanceof ListHandle )
		{
			ListScriptExecutor.handleOnPrepare( ( ListHandle ) handle,
					executionContext );
		} else if ( handle instanceof TableHandle )
		{
			TableScriptExecutor.handleOnPrepare( ( TableHandle ) handle,
					executionContext );
		} else if ( handle instanceof TextItemHandle )
		{
			TextItemScriptExecutor.handleOnPrepare( ( TextItemHandle ) handle,
					executionContext );
		} else if ( handle instanceof TextDataHandle )
		{
			DynamicTextScriptExecutor.handleOnPrepare( ( TextDataHandle ) handle,
					executionContext );
		} else