fix bug when extracting activities without filter / aggregators

introducing persons

Export/Export/CountActivity.php

@@ -73,12 +73,9 @@ class CountActivity implements ExportInterface
         
         $qb->select('COUNT(activity.id) as export_count_activity')
                 ->from('ChillActivityBundle:Activity', 'activity')
+                ->join('activity.person', 'person')
                 ;
         
-        if (in_array('person', $requiredModifiers)) {
-            $qb->join('activity.person', 'person');
-        }
-        
         $qb->where($qb->expr()->in('person.center', ':centers'))
             ->setParameter('centers', $centers)
             ;