select one collection string

src/app/organizations/vault/collections.component.ts

@@ -24,6 +24,7 @@ export class CollectionsComponent extends BaseCollectionsComponent {
         i18nService: I18nService, cipherService: CipherService,
         private apiService: ApiService) {
         super(collectionService, platformUtilsService, i18nService, cipherService);
+        this.allowSelectNone = true;
     }
 
     protected async loadCipher() {

src/locales/en/messages.json

@@ -2838,5 +2838,8 @@
   },
   "rotateApiKey": {
     "message": "Rotate API Key"
+  },
+  "selectOneCollection": {
+    "message": "You must select at least one collection."
   }
 }