Display message when no edits take place

[apainintheneck]

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
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  for the same issue.
• I have written new tests for these changes, as needed.

This displays an error message when no edits take place after launching the editor with the jrnl --edit command.

I tried to model the message after MsgText.NoTextReceived.

Fixes #1501

[apainintheneck]

Would it be better to make this a warning instead of an error?

[micahellison]

Would it be better to make this a warning instead of an error?

I think normal would actually be best -- it's basically the same level of message as "1 entry modified" is when you successfully edit an entry.

[apainintheneck]

If that's the case, I think the no text received message should also be normal since they are similar messages. This can happen normally when submitting an empty journal entry so it's not always an error.

Currently it looks like this:

But they both could look like this:

[micahellison]

Thanks for these changes, and for making it more consistent.