Fix bug causing editing to break when there are empty blocks of a lan…

…guage that uses a StreamParser

src/editor/lang-heynote/nested-parser.js

@@ -22,7 +22,13 @@ export function configureNesting() {
         if (id == NoteContent) {
             let noteLang = node.node.parent.firstChild.getChildren(NoteLanguage)[0]
             let langName = input.read(noteLang?.from, noteLang?.to)
-            //console.log("langName:", langName)
+
+            // if the NoteContent is empty, we don't want to return a parser, since that seems to cause an 
+            // error for StreamLanguage parsers when the buffer size is large (e.g >300 kb)
+            if (node.node.from == node.node.to) {
+                return null
+            }
+
             if (langName in languageMapping && languageMapping[langName] !== null) {
                 //console.log("found parser for language:", langName)
                 return {