showing tooltip for user not in user table

[manishbisht]

Fixes #12718

• Has proper Signed-Off-By
• Has commit message which describes it
• Is needed on it's own, if you have just minor fixes to previous commits, you can squash them
• Any new functionality is covered by tests

[codecov]

Codecov Report

Merging #13305 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master   #13305      +/-   ##
==========================================
+ Coverage   54.53%   54.53%   +<.01%     
==========================================
  Files         466      466              
  Lines       70385    70388       +3     
==========================================
+ Hits        38382    38386       +4     
+ Misses      32003    32002       -1

[nijel]

Thanks I've merged your change with minor edits (coding style and reusing message we use elsewhere for this) as 253c9be.