fix: fallback to to default code block language if no descriptor found

Fixes #423

src/plugins/codeblock/CodeBlockNode.tsx

@@ -1,7 +1,7 @@
 import { useCellValue } from '@mdxeditor/gurx'
 import { DecoratorNode, EditorConfig, LexicalEditor, LexicalNode, NodeKey, SerializedLexicalNode, Spread } from 'lexical'
 import React from 'react'
-import { CodeBlockEditorProps } from '.'
+import { CodeBlockEditorProps, defaultCodeBlockLanguage$ } from '.'
 import { voidEmitter } from '../../utils/voidEmitter'
 import { NESTED_EDITOR_UPDATED_COMMAND, codeBlockEditorDescriptors$ } from '../core'
 
@@ -218,11 +218,16 @@ const CodeBlockEditorContainer: React.FC<
   } & CodeBlockEditorProps
 > = (props) => {
   const codeBlockEditorDescriptors = useCellValue(codeBlockEditorDescriptors$)
+  const defaultCodeBlockLanguage = useCellValue(defaultCodeBlockLanguage$)
 
-  const descriptor = codeBlockEditorDescriptors
+  let descriptor = codeBlockEditorDescriptors
     .sort((a, b) => b.priority - a.priority)
     .find((descriptor) => descriptor.match(props.language || '', props.meta || ''))
 
+  if (!descriptor) {
+    descriptor = codeBlockEditorDescriptors.find((descriptor) => descriptor.match(defaultCodeBlockLanguage || '', props.meta || ''))
+  }
+
   if (!descriptor) {
     throw new Error(`No CodeBlockEditor registered for language=${props.language} meta=${props.meta}`)
   }