Merge pull request #4 from MariuszT/master

get_virtualchest will return null if no virtual chest exists. Thanks MariusT!

src/main/java/me/entityreborn/chvirtualchests/functions/General.java

@@ -70,7 +70,7 @@ public Construct exec(Target t, Environment environment, Construct... args) thro
             }
 
             if (VirtualChests.get(id) == null) {
-                VirtualChests.set(id, VirtualChests.create(id));
+                return new CNull(t);
             }
 
             MCInventory inv = VirtualChests.get(id);