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
apply( slot.get( i ) );
		}
	}
	public void visitTextDataItem( TextDataHandle handle )
	{
		handleOnPrepare( handle );
	}
	public void visitParameterGroup( ParameterGroupHandle handle )
	{
		
		SlotHandle parameters = handle.getParameters( );
		int size = parameters.getCount( );
		for ( int n = 0; n < size; n++ )
		{
			apply( parameters.get( n ) );
		}
	}
	public void visitCascadingParameterGroup(
			CascadingParameterGroupHandle handle )
	{
		
		SlotHandle parameters = handle.getParameters( );
		int size = parameters.getCount( );
		for ( int n = 0; n < size; n++ )
		{
			apply( parameters.get( n ) );
		}
	}
	public void visitScalarParameter( ScalarParameterHandle handle )
	{