[backend] Distributions : gestion des abonnements manquants

backend/views/distribution/index.php

@@ -274,7 +274,7 @@ $this->setPageTitle('Distributions') ;
                             <div class="clr"></div>
                     </div>
 
-                <div class="alert alert-danger" v-if="missingSubscriptions.length > 0">
+                <div class="alert alert-danger" v-if="missingSubscriptions && missingSubscriptions.length > 0">
                     {{ missingSubscriptions.length }} abonnement<template v-if="missingSubscriptions.length > 1">s</template> manquant<template v-if="missingSubscriptions.length > 1">s</template> :
                     <ul>
                         <li v-for="subscription in missingSubscriptions">{{ subscription.username }}</li>