old_contents: import os
  
  from django.conf import settings
  
  base_dir = getattr(settings, 'BASE_DIR') or getattr(settings, 'PROJECT_DIR')
  PID_FILE = getattr(settings, 'CRON_PID_FILE', os.path.join(base_dir, 'cron_pid.pid'))
  RETRY = getattr(settings, 'CRON_RETRY', False)
  
new_contents: import os
  
  from django.conf import settings
  
  base_dir = getattr(settings, 'BASE_DIR', '') or getattr(settings, 'PROJECT_DIR', '')
  PID_FILE = getattr(settings, 'CRON_PID_FILE', os.path.join(base_dir, 'cron_pid.pid'))
  RETRY = getattr(settings, 'CRON_RETRY', False)
  
subject: add fallback value for base_dir setting, or it might raise errors