Fix issue undefined index, bump to v2.1.1

Fixes #112

An issue with $tag['code'] is not set when viewed on an archive page
created by Beaver Builder. This adds an isset() check to avoid the
error.

Author: mkaz

index.php

@@ -3,7 +3,7 @@
  * Plugin Name:  Code Syntax Block
  * Plugin URI:   https://github.com/mkaz/code-syntax-block
  * Description:  A plugin to extend Gutenberg code block with syntax highlighting
- * Version:      2.1.0
+ * Version:      2.1.1
  * Author:       Marcus Kazmierczak
  * Author URI:   https://mkaz.blog/
  * License:      GPL2
@@ -14,7 +14,7 @@
  */
 
 // version added, used in URL
-const MKAZ_CODE_SYNTAX_BLOCK_VERSION = '2.1.0';
+const MKAZ_CODE_SYNTAX_BLOCK_VERSION = '2.1.1';
 const MKAZ_CODE_SYNTAX_DEFAULT_SCHEME = 'prism-a11y-dark';
 const MKAZ_CODE_SYNTAX_COLOR_SCHEMES = ['prism-a11y-dark', 'prism-ghcolors', 'prism-nord', 'prism-onedark'];
 require dirname( __FILE__ ) . '/prism-languages.php';
@@ -214,7 +214,7 @@ function mkaz_prism_theme_css_ver() {
 // extend code tag to allow lang attribute
 add_filter( 'wp_kses_allowed_html', function( $tags ) {
 
-	if ( is_array( $tags['code'] ) ) {
+	if ( isset( $tags['code'] ) && is_array( $tags['code'] ) ) {
 		$tags['code']['lang'] = array();
 	} else {
 		$tags['code'] = array(

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mkaz-code-syntax-block",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "license": "GPL-2.0-or-later",
   "repository": {
     "type": "git",

readme.txt

@@ -5,7 +5,7 @@ Tags: code, code syntax, syntax highlight, code highlighting
 Requires at least: 5.0
 Tested up to: 5.8
 Requires PHP: 5.6
-Stable tag: 2.1.0
+Stable tag: 2.1.1
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
 
@@ -108,6 +108,12 @@ Example:
 
 == Changelog ==
 
+= 2.1.1 =
+
+- Fix undefined index error with $tag['code'] not defined
+  on archive page triggered by Beaver Builder
+
+
 = 2.1.0 =
 
 - Fix background color not being applied unless language specified.