Fix CommandPart.generateArgumentArray for vararg

SpigotCore_Main/src/de/steamwar/command/CommandPart.java

@@ -84,7 +84,7 @@ public class CommandPart {
     }
 
     public void generateArgumentArray(List<Object> current, CommandSender commandSender, String[] args, int startIndex) {
-        if (startIndex >= args.length) {
+        if (startIndex >= args.length && varArgType == null) {
             throw new CommandParseException();
         }