fix: text before heading in markdown reader (#864)

.changeset/good-carpets-rhyme.md

+---
+"llamaindex": minor
+---
+
+Fix text before heading in markdown reader

packages/core/src/readers/MarkdownReader.ts

@@ -43,6 +43,8 @@ export class MarkdownReader implements FileReader {
             continue;
           }
           markdownTups.push([currentHeader, currentText]);
+        } else if (currentText) {
+          markdownTups.push([null, currentText]);
         }
 
         currentHeader = line;