[BUGFIX] Properly handle TCA description overrides

Only apply TCA description override if it actually exists.

Resolves: #100062
Releases: main
Change-Id: I85a21419b9612e8e7738ea82094b262fc2ebacb3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78009


Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>

typo3/sysext/backend/Classes/Form/FormDataProvider/TcaColumnsProcessFieldDescriptions.php

@@ -58,10 +58,13 @@ class TcaColumnsProcessFieldDescriptions implements FormDataProviderInterface
             if (!is_array($fieldTSconfig)) {
                 continue;
             }
-            $result['processedTca']['columns'][$fieldName]['description'] = $languageService->translateLabel(
+            $pageTsConfigDescription = $languageService->translateLabel(
                 $fieldTSconfig['description.'] ?? [],
                 $fieldTSconfig['description'] ?? ''
             );
+            if ($pageTsConfigDescription !== '') {
+                $result['processedTca']['columns'][$fieldName]['description'] = $pageTsConfigDescription;
+            }
         }
         return $result;
     }