Activity description might have empty parts (in Meanwhile column, mainly)

[jankusanagi]

A client can publish a note with the _displayName_ property set to "" (empty string), which would result in something like "JohnDoe posted a comment in reply to", without anything after "to", where something like "a note", or a specific title for that note/picture/object should be.

While this is probably something the clients should avoid (setting the displayName property if it's empty), I guess pump.io should check for empty displayName's and treat them as "no displayName present".

This can be seen in the Meanwhile column or in notification e-mails, and can be caused, for instance, by older versions of Dianara, by posting an image with an empty title.

[strugee]

Closing as the corresponding PR was merged just under a year ago :)