Merge pull request #6 from simonLeary42/patch-3

use empty array when attribute is null

Author: hakasapl

src/PHPOpenLDAPer/LDAPEntry.php

@@ -334,7 +334,7 @@ public function getAttribute($attr)
         if (isset($this->object[$attr])) {
             return $this->object[$attr];
         } else {
-            return null;
+            return [];
         }
     }