Update haserrormsg logic implementation.

Dependencies

• [2] EWIMH4Y5 Handle case where jobset has no defined errormsg for api/jobsets
• [3] BKOIYITR added some json responses
• [4] FRTDCC6I Extend the jobset API response
• [5] NGFKXI5F Add `haserrormsg` boolean attribute to jobset API response

Change contents

• replacement in src/lib/Hydra/Controller/API.pm at line 91
  [3.41]→[2.0:119](∅→∅)
  − haserrormsg => defined($jobset->errormsg) ? ($jobset->errormsg eq "" ? JSON::false : JSON::true) : JSON::false
  [3.41]

  [3.2922]
  + haserrormsg => defined($jobset->errormsg) && $jobset->errormsg ne "" ? JSON::true : JSON::false