I can't post comment in the Pixelfed instances

[lichingyun]

Describe the bug
I am active user in pixelfed.uno and in pixelfed.social, I discover is not possible to comment others users post.

To reproduce

Steps to reproduce the behavior:

1. Go to 'pixelfed.uno" or "pixelfed.social"
2. Comment to another user post
3. Write your answer
4. Is not possible to send your answer to the post

Does this happen in the official app?
No, this don't happen using Pixelfed app
This error is not show in the log error

Screenshots and screen recordings
I have added the screenshot, on the right part of the image the button in the yellow circle isn't working

Version

Moshidon version: I have try the latest stable and the latest nightly

[lichingyun]

I have also tried Husky and Pixeldroid and is possible to comment without problems.
In the Pixelfed instances using Moshidon is like if the "post" button is inactive

[lichingyun]

I found out that if I reply to a post by attaching an image the send button is activated and I can write and send the comment. If I delete the image the send button is deactivated and the comment cannot be sent

[FineFindus]

It was added on purpose in sk22@b93b184, presumably to avoid some kind of error?
Does Pixelfed allow posts without images, and the check is just missing a check if it is a reply? Also, can replies contain images?

[lichingyun]

It was added on purpose in sk22@b93b184, presumably to avoid some kind of error? Does Pixelfed allow posts without images, and the check is just missing a check if it is a reply? Also, can replies contain images?

Hello, in Pixelfed the first post in a tread must contain one or more images and a text, the reply after the first post can be only text messages or images and words at a user choice