Default avatar for "Ghost User"
Description
The ghost user should get a default avatar different from the "no avatar" icon other accounts get.
Proposal
It would be nice if one can clearly distinguish between a normal user who just hasn't set his avatar and the ghost user at first glance.
Links / references
Maybe just use a ghost emoji? http://emojipedia.org/ghost/
Documentation blurb
None necessary.
Use cases
When skimming merge requests, it's quite useful to see which comments are from current users and which are from deleted users.
Feature checklist
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Avatar icon -
"Ghost User" user avatar