Simplify SWCommand Constructor

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

@@ -37,6 +37,10 @@ public abstract class SWCommand {
     private final Set<InternalTabComplete> tabCompleteSet = new HashSet<>();
     private Consumer<CommandSender> helpMessage = sender -> {};
 
+    protected SWCommand(String command) {
+        this(command, new String[0]);
+    }
+
     protected SWCommand(String command, String... aliases) {
         SWCommandUtils.commandMap.register("steamwar", new Command(command, "", "/" + command, Arrays.asList(aliases)) {
             @Override