MDL-82904 core_badges: Display empty column for unset criteria

* In the report builder badges with unset criteria should have a empty
value for the criteria column

badges/classes/reportbuilder/local/entities/badge.php

@@ -160,7 +160,9 @@ protected function get_all_columns(): array {
                     return '';
                 }
                 $badge = new \core_badges\badge($badgeid);
-
+                if (empty($badge->criteria)) {
+                    return '';
+                }
                 $renderer = $PAGE->get_renderer('core_badges');
                 return $renderer->print_badge_criteria($badge, 'short');
             });