Don't send empty messages

src/main/java/tsp/headdb/util/Utils.java

@@ -37,8 +37,10 @@ public class Utils {
     }
 
     public static void sendMessage(CommandSender sender, String message) {
+        if (!message.isEmpty()) {
             sender.sendMessage(colorize(message));
         }
+    }
 
     public static String colorize(String string) {
         return ChatColor.translateAlternateColorCodes('&', string);