Stop import command when KitsX files are missing

- Return early after reporting missing import files
- Prevent running the importer when required data is absent

Author: rossnoah

src/main/java/dev/noah/perplayerkit/commands/admin/PerPlayerKitCommand.java

@@ -82,6 +82,7 @@ private boolean handleImport(CommandSender sender, String[] args) {
         if (!importer.checkForFiles()) {
             sender.sendMessage(ChatColor.RED + "Missing files to import");
             sender.sendMessage(ChatColor.RED + "Copy data folder from KitsX into the PerPlayerKit folder");
+            return true;
         }
 
         importer.importFiles();