Check if LDAP logger is defined

app/Api/User.php

@@ -87,6 +87,7 @@ class User extends \Kanboard\Core\Base
         try {
 
             $ldap = LdapClient::connect();
+            $ldap->setLogger($this->logger);
             $user = LdapUser::getUser($ldap, $username);
 
             if ($user === null) {

app/Core/Ldap/Client.php

@@ -198,4 +198,15 @@ class Client
     {
         return $this->logger;
     }
+
+    /**
+     * Test if a logger is defined
+     *
+     * @access public
+     * @return boolean
+     */
+    public function hasLogger()
+    {
+        return $this->logger !== null;
+    }
 }

app/Core/Ldap/Query.php

@@ -48,7 +48,7 @@ class Query
      */
     public function execute($baseDn, $filter, array $attributes)
     {
-        if (DEBUG) {
+        if (DEBUG && $this->client->hasLogger()) {
             $this->client->getLogger()->debug('BaseDN='.$baseDn);
             $this->client->getLogger()->debug('Filter='.$filter);
             $this->client->getLogger()->debug('Attributes='.implode(', ', $attributes));