Initialize $s_group array if not passed in all_parameters

distfiles/search.php

@@ -105,6 +105,7 @@ extract($incoming, EXTR_SKIP);
 if (!isset($search)) $search=false;
 if (!isset($viewtype)) $viewtype="summary";
 if (!isset($s_id)) $s_id=NULL;
+if (!isset($s_group)) $s_group=[];
 if (!isset($s_discrepancy_text)) $s_discrepancy_text=NULL;
 if (!isset($s_reported_by)) $s_reported_by=NULL;
 if (!isset($s_action_text)) $s_action_text=NULL;