B17224: Fixed undefined variable $rowHtml. refs #17224

extension/Classes/Core/AbstractBuildForm.php

@@ -2443,6 +2443,7 @@ abstract class AbstractBuildForm {
      */
     private function buildSubrecordRowsHtml(array $formElement, array $rowSettings, $additionalRow = false): string {
         $htmlBody = '';
+        $rowHtml = '';
         $subrecordToken = FE_SQL1;
 
         // Configure formElement array for additional rows.
@@ -2452,7 +2453,6 @@ abstract class AbstractBuildForm {
         }
 
         foreach ($formElement[$subrecordToken] as $row) {
-            $rowHtml = '';
 
             if ($formElement[FE_MODE] == FE_MODE_READONLY) {
                 $editToolTip = 'Show';