fixed formatting empty text

src/index.tsx

@@ -36,7 +36,6 @@ render(
   [stage 1]
   - signup?
   - import videos
-  - import graffiti
   - text post can also has songs http://vault48.org/post5052
   - fulltext search: https://github.com/typeorm/typeorm/issues/3191
   - zoom: https://manuelstofer.github.io/pinchzoom/
@@ -47,6 +46,7 @@ render(
   - comment editing
   
   Done:
+  - import graffiti
   - <...> format
   - youtube embeds
   - mobile header

src/utils/dom.ts

@@ -100,10 +100,12 @@ export const formatText = (text: string): string =>
         .join('\n');
 
 export const formatTextParagraphs = (text: string): string =>
+  (text &&
     text
       .split('\n')
       .map(str => `<p>${str}</p>`)
-    .join('\n');
+      .join('\n')) ||
+  null;
 
 export const findBlockType = (line: string): ValueOf<typeof COMMENT_BLOCK_TYPES> => {
   const match = Object.values(COMMENT_BLOCK_DETECTORS).find(detector => line.match(detector.test));