Fix incorrect update requirement detection

public/typo3conf/ext/ep_products/Classes/Service/ImportTimestampService.php

@@ -30,7 +30,9 @@ class ImportTimestampService
         $updatedTimestampPath = GeneralUtility::getFileAbsFileName($uploadTimestampFile);
 
         if (!$updatedTimestampPath || !file_exists($updatedTimestampPath)) {
-            return false;
+            $this->writeImportTimestamp($importTimestampFile);
+
+            return true;
         }
 
         $line = trim(file($updatedTimestampPath)[0]);