Merge branch 'Issue/3018-disableMultiFileDownload' into 'dev'

Update: Disable Download when multiple files are selected

See merge request !462

src/modules/resource/components/resource-page/metadata/MetadataManagerHeader.vue

@@ -106,7 +106,9 @@
         </b-dropdown>
         <b-button
           v-if="!editableDataUrl"
-          :disabled="!showDetail || shownFiles.length === 0"
+          :disabled="
+            !showDetail || shownFiles.length === 0 || !currentFolderContent
+          "
           @click="$emit('download')"
         >
           {{ $t("page.resource.metadataManagerBtnDownload") }}