[Administration] Support admin : correctif affichage nombre tickets ouverts

backend/views/layouts/left.php

             $countTicketsLabel = '<span class="pull-right-container"><small class="label pull-right bg-green">' . $countTicketsAdminUnread . '</small></span>';
         } else {
             $countTicketsAdminOpen = $ticketModule->getRepository()->countTicketsAdminStatusOpen();
-            $countTicketsLabel = '<span class="pull-right-container"><small class="label pull-right bg-blue">' . $countTicketsAdminOpen . '</small></span>';
+            if($countTicketsAdminOpen) {
+                $countTicketsLabel = '<span class="pull-right-container"><small class="label pull-right bg-blue">' . $countTicketsAdminOpen . '</small></span>';
+            }
         }
 
         $sumUserProducerCredits = $userProducerModule->sumUserProducerCredits();