Show any error message when submitting a reply. I attached a patch.
However, I'm worried that if the number of replies increases, the error message, and the reply input fields will be separated.

!{width:600px;border:1px solid #ccc;}show_any_error_when_reply.png!
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Yuichi HARADA wrote:
> However, I'm worried that if the number of replies increases, the error message, and the reply input fields will be separated.

You are right. Thank you for pointing it out.

And I found that the behavior that showing an error is not consistent with issues. When updating issues, no error is shown even if note is empty. Its behavior is similar to forums but the only difference is the behavior when adding attachments with an empty note. In the case, attachments are added to the issue.

I think the following behavior is better for forums. It is consistent with the behavior of issues.

* Empty message _without_ attachments: Almost the same behavior with the current behavior but "Successful update" message should not be shown
* empty message _with_ attachments: Attach the files instead of discarding them

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Go MAEDA wrote:
> I think the following behavior is better for forums. It is consistent with the behavior of issues.
>
> * Empty message _without_ attachments: Almost the same behavior with the current behavior but "Successful update" message should not be shown
> * empty message _with_ attachments: Attach the files instead of discarding them

Thank you for pointing it out. I attached a patch that incorporates the above behaviors.
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