$ arc get-config
ERROR 8192: strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:292]
arcanist(head=master, ref.master=98d16d27cf3e)
  #0 ArcanistWorkingCopyIdentity::readLocalArcConfig() called at [<arcanist>/src/configuration/ArcanistConfigurationManager.php:153]
  #1 ArcanistConfigurationManager::readLocalArcConfig() called at [<arcanist>/src/workflow/ArcanistGetConfigWorkflow.php:53]
  #2 ArcanistGetConfigWorkflow::run() called at [<arcanist>/scripts/arcanist.php:427]