* lisp/vc/vc-annotate.el: Better error handling (bug#34532)

* lisp/vc/vc-annotate.el (vc-annotate-revision-previous-to-line):
Print message when prev-rev is nil.
1 job for master in 60 minutes and 1 second (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #920
test-all

01:00:01

 
Name Stage Failure
failed
test-all Test The script exceeded the maximum execution time set for the job
  GEN      lisp/international/ccl-tests.log
ELC lisp/international/mule-tests.elc
GEN lisp/international/mule-tests.log
ELC lisp/international/mule-util-tests.elc
GEN lisp/international/mule-util-tests.log
ELC lisp/international/ucs-normalize-tests.elc
GEN lisp/international/ucs-normalize-tests.log
Pulling docker image gitlab/gitlab-runner-helper:x86_64-f100a208 ...
ERROR: Job failed: execution took longer than 1h0m0s seconds