Make sure exporter do not inject warnings/notify messages into document

- Also remove extra include of settings. No longer needed.

classes/Exporter.php

@@ -39,7 +39,7 @@ class Exporter
         array_push($triples, $t);
         $t['o'] = LS . 'Application';
         array_push($triples, $t);
-        if ($conf['parentApp'] != null) {
+        if (isset($conf['parentApp']) && $conf['parentApp'] !== null) {
             $t['p'] = OPMV . 'wasDerivedFrom';
             $t['o'] = $conf['parentApp'];
             array_push($triples, $t);

index.php

@@ -47,7 +47,6 @@ if ($acceptContentType === null) {
 }
 
 if ($conf['export'] && $_GET['q'] === 'export') {
-    include_once('settings.inc.php');
     $exp = new Exporter();
     header('Content-Type: text/plain');
     $exp->run();