[Pushed] Preview empty new message doesn't throw errors

[Poftorek]

Hello,

Steps:

1. Go to /private.php?action=send
   
2. Click Preview button
   
3. You do not see errors, that the message is empty, as it happens after clicking save as a draft or preview an empty post on forums
   

[Ben]

Hi,

Thank you for your report. We have pushed this issue to our Github repository for further analysis where you can track our commits and progress with fixing this bug. Discussions regarding this bug may also take place there too.

Follow this link to visit the issue on Github: https://github.com/mybb/mybb/issues/4115

Thanks for contributing to MyBB!

Regards,
The MyBB Group