Fixed NodeFactory enum check

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/NodeFactory.java

@@ -59,10 +59,12 @@ public class NodeFactory
             case Customer:
                 n = new Customer(startMoney);
                 break;
+            default:
         }
 
+        if (n != null)
+        {
             String[] subs = subsChannels.split(";");
-
             for (String s : subs)
             {
                 String[] el = s.split(" ");
@@ -70,7 +72,7 @@ public class NodeFactory
                 ChannelPool temp = FoodChain.getFactoryManager().getPoolDatabaseInstance().getChannelPoolInstance();
                 n.subscribeToChannel(temp.findByType(ProductType.valueOf(el[0])), ChannelSubscriptionType.valueOf(el[1]));
             }
-
+        }
         return n;
     }
 }