message: add handler for error in exchange ticket
diff: @@ -146,6 +146,8 @@ export class AlfrescoApi implements EventEmitter.Emitter {
  authContentApi.getTicket().then((ticketEntry: TicketEntry) => {
  this.oauth2Auth.config.ticketEcm = ticketEntry.entry.id;
  this.emit('ticket_exchanged');
  + },()=>{
  + console.log('impossible to exchange ticket');
  });
  }
  });
  