bug#34387: 26.1; Gnus: handle empty message parts

[Katsumi Yamaoka]

On Thu, 14 Feb 2019 08:20:20 +0900, Katsumi Yamaoka wrote:
> I'll close this thread after fixing the other two related bugs.

>> 1. In the article buffer, pressing the RET key on an empty
>>  text/plain attachment conceals the succeeding other attachments,
>>  does not toggle.  `g' restores them of course, though.

>> 2. Some kind of an empty mail isn't able to be edited using the
>>  `e' command (gnus-summary-edit-article), that is, a single part
>>  email whose body is an empty attachment.  Gnus misunderstands
>>  that the header is its body.

Done.  Closing.