Fix bad check

src/controllers/comments_controller.rs

@@ -22,7 +22,7 @@ pub fn create(r: &mut HttpRequestHandler) -> RequestResult {
 
     let (content, image) = if r.has_file("image") {
         (
-            remove_html_nodes(&r.post_string("content")?),
+            remove_html_nodes(&r.post_string_opt("content", 0, false)?),
             Some(r.save_post_image("image", PATH_COMMENTS_IMAGES, 700, 700)?)
         )
     } else {