Do not stomp on contact ID

CRM/CallNextDashlet/Page/CallNextDashlet.php

@@ -226,9 +226,11 @@ class CRM_CallNextDashlet_Page_CallNextDashlet extends CRM_Core_Page {
     }
     foreach($activities_none['values'] AS $activity) {
       if (empty($activity['assignee_contact_id'])) {
-        $contactID = array_shift($activity['target_contact_id']);
-        if (self::can_view_contact($contactID)) {
-          $activities[] = $activity;
+        foreach($activity['target_contact_id'] AS $contactID) {
+          if (self::can_view_contact($contactID)) {
+            $activities[] = $activity;
+            break;
+          }
         }
       }
     }