[BUGFIX] The author TCA cannot be opened in TYPO3 8

Configuration/TCA/tx_sgnews_domain_model_author.php

@@ -24,7 +24,7 @@
  * This copyright notice MUST APPEAR in all copies of the script!
  */
 
-return [
+$configuration = [
 	'ctrl' => [
 		'title' => 'LLL:EXT:sg_news/Resources/Private/Language/locallang_db.xlf:tx_sgnews_domain_model_author',
 		'label' => 'name',
@@ -197,3 +197,12 @@ return [
 		],
 	]
 ];
+
+
+// The slug field isn't available for TYPO3 8 and below.
+if (TYPO3\CMS\Core\Utility\VersionNumberUtility::convertVersionNumberToInteger(TYPO3_version) < 9000000) {
+	unset($configuration['columns']['path_segment']);
+	$configuration['types'] = str_replace('path_segment', '', $configuration['types']);
+}
+
+return $configuration;