Add message when no benevole

src/views/PlanningOutput.vue

@@ -2,7 +2,8 @@
   <navigation-panel v-model="show" :options="navOption">
     <planning v-if="show == 'benevole'" />
     <div v-if="show == 'card'" class="benevole-container">
-      <benevole-card v-for="(b, idx) in benevoles" :benevole="b" :key="idx" />
+      <span v-if="benevoles.lenght > 0">Pas de bénévole</span>
+      <benevole-card v-else v-for="(b, idx) in benevoles" :benevole="b" :key="idx" />
     </div>
   </navigation-panel>
 </template>