Merge pull request #618 from CocoTheOwner/pregenFix

Engine is null again dan!

src/main/java/com/volmit/iris/core/commands/CommandPregen.java

@@ -42,6 +42,10 @@ public class CommandPregen implements DecreeExecutor {
                     Vector center
     ) {
         try {
+            if (access() == null) {
+                sender().sendMessage(C.RED + "The engine access for this world is null!");
+                sender().sendMessage(C.RED + "Please make sure the world is loaded & the engine is initialized. Generate a new chunk, for example.");
+            }
             IrisToolbelt.pregenerate(PregenTask
                     .builder()
                     .center(new Position2(center))