Bugfix: Squash warning when determining language in the fenced code block extensions

Changelog.md

@@ -26,6 +26,9 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
      - Don't worry, we've absorbed all the useful features (see above) 
      - NOTE TO SELF: Don't forget to update wikimatrix.org when we next make a stable release!
 
+### Fixed
+ - Squashed a warning when using the fenced code block syntax
+
 
 ## v0.21
 

modules/parser-parsedown.php

@@ -1244,7 +1244,8 @@ class PeppermintParsedown extends ParsedownExtra
 		global $settings;
 		$result = parent::blockFencedCodeComplete($block);
 		
-		$language = preg_replace("/^language-/", "", $block["element"]["element"]["attributes"]["class"]);
+		// Default value: "text"
+		$language = preg_replace("/^language-/", "", $block["element"]["element"]["attributes"]["class"] ?? "language-text");
 		
 		if(!isset($settings->parser_ext_renderers->$language))
 			return $result;