fix: don't reject open applications in case of open slots

src/EventListener/RejectApplicationListener.php

@@ -28,7 +28,15 @@ class RejectApplicationListener
         }
 
         $disposition = $document->getDisposition();
+        $assignment = $disposition->getAssignment();
+
+        // skip further processing in case there are open slots left
+        if ($assignment->getConfirmedDispositions()->count() < $assignment->getAvailableDispositions()) {
+            return;
+        }
+
         $teamer = $disposition->getTeamer();
+
         $otherApplications = $disposition
             ->getAssignment()
             ->getApplications()