[BUGFIX] Call autocomplete only if field is available

Resolves: #84335
Related: #82592
Related: #82969
Releases: master
Change-Id: I6afa442fdfb86e2ffeff0b3c39c12ed2c7e8df6c
Reviewed-on: https://review.typo3.org/56211
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>

typo3/sysext/backend/Resources/Private/TypeScript/LiveSearch.ts

@@ -173,7 +173,6 @@ class LiveSearch {
 
   private registerEvents(): void {
     const $searchField = $(Identifiers.searchFieldSelector);
-    const $autocompleteContainer = $('.' + $searchField.autocomplete().options.containerClass);
 
     $(Identifiers.containerSelector).on('click', '.t3js-live-search-show-all', (evt: JQueryEventObject): void => {
       evt.preventDefault();
@@ -182,6 +181,7 @@ class LiveSearch {
       $searchField.val('').trigger('change');
     });
     if ($searchField.length) {
+      const $autocompleteContainer = $('.' + $searchField.autocomplete().options.containerClass);
       $autocompleteContainer.on('click.autocomplete', '.dropdown-list-link', (evt: JQueryEventObject): void => {
         evt.preventDefault();