TandemPair::createTerminatedTandemPair: no not return a terminated pair if one...

TandemPair::createTerminatedTandemPair: no not return a terminated pair if one of the user-IDs is not set, fixes #13

models/TandemPair.class.php

@@ -161,6 +161,9 @@ require_once(__DIR__ . '/TerminatedTandemPair.class.php');
      */
     public function createTerminatedTandemPair()
     {
+        if (!$this->request->user_id || !$this->offer->user_id) {
+            return null;
+        }
         $terminated_pair = new TerminatedTandemPair();
         $terminated_pair->requester_user_id = $this->request->user_id;
         $terminated_pair->requester_level = $this->request->level;

plugin.manifest

 pluginname=TandemPlugin
 pluginclassname=TandemPlugin
 origin=data-quest
-version=1.0.7
+version=1.0.8
 description=Dieses Plugin ermöglicht es, Sprachtandems innerhalb der Stud.IP Platform zu bilden.
 studipMinVersion=4.0
 studipMaxVersion=4.99.99