fix small issue with haproxy reload

Author: travisghansen

src/KubernetesPfSenseController/Plugin/PfSenseAbstract.php

@@ -139,6 +139,11 @@ public function reloadHAProxy()
 $messages = null;
 $reload = 1;
 $ok = haproxy_check_and_run($messages, $reload);
+
+if($messages == null) {
+	$messages = "";
+}
+
 $toreturn = [
     'ok' => $ok,
     'messages' => $messages,