added maintainer data to closed maintenances

Step.Database/Controllers/MaintenancesController.cs

@@ -36,7 +36,9 @@ namespace Step.Database.Controllers
                                                             where m1.MaintenanceId == maintenances.MaintenanceId
                                                             select m1.Date
                                                             ).Max()
-                                select maintenances).ToList();
+                                select maintenances)
+                                .Include("Maintainer")
+                                .ToList();
 
             return lastMaintenances;
         }