[openstreetmap/openstreetmap-website] Added indicator message preview is empty. (PR #4894)

[Anton Khorev]

@AntonKhorev commented on this pull request.



> +    if (editor.val().length === 0) {
+      var messageTitleElement = document.getElementById("message_title");
+      if (messageTitleElement) {
+        messageTitleElement.removeAttribute("required");
+      }
+
+      var diaryEntryTitleElement = document.getElementById("diary_entry_title");
+      if (diaryEntryTitleElement) {
+        diaryEntryTitleElement.removeAttribute("required");
+      }
+
+      return;
+    }
+

I don't necessarily agree that triggering the validation is a good idea, but if you really want to do it, you can just call `reportValidity` on an input:

```suggestion
    event.preventDefault();

    if (!editor[0].reportValidity()) {
      return;
    }
```

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