Cope with users without avatars + minor log message reformatting

2 jobs for master in 3 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #458
test

00:00:03

 
  Build
skipped #459
build
 
Name Stage Failure
failed
test Test
   fabad29..f37c96d  master     -> origin/master
Checking out f37c96d3 as master...
Skipping Git submodules setup
Checking cache for default...
time="2020-04-04T23:11:50+08:00" level=error msg="Docker executor: prebuilt image helpers will be loaded from /var/lib/gitlab-runner."
Successfully extracted cache
$ rustc --version
bash: line 78: rustc: command not found
ERROR: Job failed: exit status 1