From b9604e39bdcbab223f0008c50cc9702d5a8799bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mi=CC=81ng?= <minglq.9@gmail.com>
Date: Thu, 27 Apr 2023 19:18:08 +0800
Subject: [PATCH] Try to fix unit test error.

---
 Michelf/MarkdownExtra.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Michelf/MarkdownExtra.php b/Michelf/MarkdownExtra.php
index 638e30d..f814cde 100644
--- a/Michelf/MarkdownExtra.php
+++ b/Michelf/MarkdownExtra.php
@@ -1196,7 +1196,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$head		= $matches[1];
 		$underline	= $matches[2];
 		$content	= $matches[3];
-		$id_class	= $matches[4];
+		$id_class	= $matches[4] ?? null;
 
 		$content	= preg_replace('/^ *[|]/m', '', $content);
 
@@ -1226,7 +1226,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$head		= $matches[1];
 		$underline	= $matches[2];
 		$content	= $matches[3];
-		$id_class	= $matches[4];
+		$id_class	= $matches[4] ?? null;
 		$attr		= [];
 
 		// Remove any tailing pipes for each line.
@@ -1256,7 +1256,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 
 		// Write column headers.
 		$table_attr_str = $this->doExtraAttributes('table', $id_class, null, []);
-		$text = "<table {$table_attr_str}>\n"; 
+		$text = "<table$table_attr_str>\n"; 
 		$text .= "<thead>\n";
 		$text .= "<tr>\n";
 		foreach ($headers as $n => $header) {