Fix placeholder css

packages/file-handling/src/nextcloud-file-picker.js

@@ -12,6 +12,7 @@ import {TabulatorFull as Tabulator} from 'tabulator-tables';
 import MicroModal from './micromodal.es';
 import {name as pkgName} from './../package.json';
 import * as fileHandlingStyles from './styles';
+import * as tabulatorStyles from './tabulator-table-styles';
 import {encrypt, decrypt, parseJwt} from './crypto.js';
 
 /**
@@ -2410,6 +2411,7 @@ export class NextcloudFilePicker extends ScopedElementsMixin(DBPLitElement) {
             ${commonStyles.getModalDialogCSS()}
             ${commonStyles.getRadioAndCheckboxCss()}
             ${fileHandlingStyles.getFileHandlingCss()}
+            ${tabulatorStyles.getTabulatorStyles()}
 
             #new-folder-row .button {
                 background-color: var(--dbp-success);

packages/file-handling/src/tabulator-table-styles.js

@@ -36,6 +36,11 @@ export function getTabulatorStyles() {
             background-color:  var(--dbp-background);
             color: var(--dbp-content);
         }
+
+        .tabulator-placeholder-contents {
+            text-align: center;
+            padding-top: 10px;
+        }
        
     `;
 }