Description of problem:
cupsd can be crashed easily.

Version-Release number of selected component (if applicable):
cups-1.4-0.b2.16

How reproducible:
100%

Steps to Reproduce:
python -c 'import cups; cups.Connection().deletePrinterOptionDefault("foo","media")'

Actual results:
cups.IPPError: (1282, 'server-error-service-unavailable')
and 'lpstat -s' shows the scheduler is no longer running.

Expected results:
Scheduler still running.