Public bug reported:

How to reproduce: 
Submit a job with media= to a printer that has foomatic-rip as one of its 
filters. 

lp -d myprinter -o media= /tmp/page.pdf

This will happen:

D  [Job 977] Pondering option 'media='
D  [Job 977] mf: filter/foomatic-rip/options.c:486: option_find_choice: 
Assertion `opt && name' failed.
D  [Job 977] PID 12709 (/usr/lib/cups/filter/foomatic-rip) crashed on signal 6.

I know it is bad idea to submit a job with blank media=, but hey, some
bad software submit it like that and I'd rather have it printed in wrong
size than have foomatic crashed on the job.

tested with cups-filters 1.0.69 and CUPS 1.7.5 on Ubuntu 12.04

Whole log of a job:
I  [Job 977] Adding start banner page "none".
I  [Job 977] Queued on "mf" by "korobkin".
D  [Job 977] Auto-typing file...
D  [Job 977] Request file type is application/pdf.
I  [Job 977] File of type application/pdf queued by "korobkin".
I  [Job 977] Adding end banner page "none".
D  [Job 977] time-at-processing=1438271262
D  [Job 977] 2 filters for job:
D  [Job 977] pdftopdf (application/pdf to application/vnd.cups-pdf, cost 66)
D  [Job 977] foomatic-rip (application/vnd.cups-pdf to printer/mf, cost 0)
D  [Job 977] job-sheets=none,none
D  [Job 977] argv[0]="mf"
D  [Job 977] argv[1]="977"
D  [Job 977] argv[2]="korobkin"
D  [Job 977] argv[3]="page.pdf"
D  [Job 977] argv[4]="1"
D  [Job 977] argv[5]="finishings=3 media= number-up=1 
job-uuid=urn:uuid:dd456ed8-b115-3112-6040-872930439147 
job-originating-host-name=localhost time-at-creation=1438271262 
time-at-processing=1438271262"
D  [Job 977] argv[6]="/var/spool/cups/d00977-001"
D  [Job 977] envp[0]="CUPS_CACHEDIR=/var/cache/cups"
D  [Job 977] envp[1]="CUPS_DATADIR=/usr/share/cups"
D  [Job 977] envp[2]="CUPS_DOCROOT=/usr/share/cups/doc-root"
D  [Job 977] envp[3]="CUPS_FONTPATH=/usr/share/cups/fonts"
D  [Job 977] envp[4]="CUPS_REQUESTROOT=/var/spool/cups"
D  [Job 977] envp[5]="CUPS_SERVERBIN=/usr/lib/cups"
D  [Job 977] envp[6]="CUPS_SERVERROOT=/etc/cups"
D  [Job 977] envp[7]="CUPS_STATEDIR=/var/run/cups"
D  [Job 977] envp[8]="HOME=/var/spool/cups/tmp"
D  [Job 977] 
envp[9]="PATH=/usr/lib/cups/filter:/usr/bin:/usr/sbin:/bin:/usr/bin"
D  [Job 977] envp[10]="SERVER_ADMIN=cups-t...@acme.com"
D  [Job 977] envp[11]="SOFTWARE=CUPS/1.7.5"
D  [Job 977] envp[12]="TMPDIR=/var/spool/cups/tmp"
D  [Job 977] envp[13]="USER=root"
D  [Job 977] envp[14]="CUPS_MAX_MESSAGE=2047"
D  [Job 977] envp[15]="CUPS_SERVER=/var/run/cups/cups.sock"
D  [Job 977] envp[16]="CUPS_ENCRYPTION=IfRequested"
D  [Job 977] envp[17]="IPP_PORT=631"
D  [Job 977] envp[18]="CHARSET=utf-8"
D  [Job 977] envp[19]="LANG=en_US.UTF-8"
D  [Job 977] envp[20]="PPD=/etc/cups/ppd/mf.ppd"
D  [Job 977] envp[21]="RIP_MAX_CACHE=128m"
D  [Job 977] envp[22]="CONTENT_TYPE=application/pdf"
D  [Job 977] envp[23]="DEVICE_URI=socket://mf.wat"
D  [Job 977] envp[24]="PRINTER_INFO=mf"
D  [Job 977] envp[25]="PRINTER_LOCATION=TEST"
D  [Job 977] envp[26]="PRINTER=mf"
D  [Job 977] envp[27]="PRINTER_STATE_REASONS=none"
D  [Job 977] envp[28]="CUPS_FILETYPE=document"
D  [Job 977] envp[29]="FINAL_CONTENT_TYPE=printer/mf"
D  [Job 977] envp[30]="AUTH_I****"
I  [Job 977] Started filter /usr/lib/cups/filter/pdftopdf (PID 12708)
I  [Job 977] Started filter /usr/lib/cups/filter/foomatic-rip (PID 12709)
I  [Job 977] Started backend /usr/lib/cups/backend/socket (PID 12710)
D  [Job 977] Calling FindDeviceById(cups-mf)
D  [Job 977] Failed to send: org.freedesktop.DBus.Error.ServiceUnknown:The name 
org.freedesktop.ColorManager was not provided by any .service files
D  [Job 977] Failed to get find device cups-mf
D  [Job 977] 'CM Color Calibration' Mode in SPOOLER-LESS: Off
D  [Job 977] Getting input from file 
D  [Job 977] foomatic-rip version 1.0.69 running...
D  [Job 977] Parsing PPD file ...
D  [Job 977] Added option ColorSpace
D  [Job 977] Added option LargeCapacityTray
D  [Job 977] Added option OptionTray
D  [Job 977] Added option ShiftTray
D  [Job 977] Added option InnerTray2
D  [Job 977] Added option ExternalTray
D  [Job 977] Added option Finisher
D  [Job 977] Added option ColorModel
D  [Job 977] Added option Resolution
D  [Job 977] Added option Duplex
D  [Job 977] Added option Collate
D  [Job 977] Added option PageSize
D  [Job 977] STATE: +connecting-to-device
D  [Job 977] Added option ImageableArea
D  [Job 977] Looking up "mf.wat"...
D  [Job 977] Added option PaperDimension
D  [Job 977] Added option InputSlot
D  [Job 977] Added option RIPrintMode
D  [Job 977] Added option RPSBitsPerPixel
D  [Job 977] Added option MediaType
D  [Job 977] Added option OutputBin
D  [Job 977] Added option StapleLocation
D  [Job 977] backendWaitLoop(snmp_fd=5, addr=0x7fea676a9168, 
side_cb=0x7fea6654f1d0)
D  [Job 977] Added option RIPunch
D  [Job 977] Added option JobHeader
D  [Job 977] Added option JobType
D  [Job 977] Added option Pin1
D  [Job 977] Added option Pin2
D  [Job 977] Added option Pin3
D  [Job 977] Added option Pin4
D  [Job 977] Added option Font
D  [Job 977] Parameter Summary
D  [Job 977] -----------------
D  [Job 977] Spooler: cups
D  [Job 977] Printer: mf
D  [Job 977] Shell: /bin/bash
D  [Job 977] PPD file: /etc/cups/ppd/mf.ppd
D  [Job 977] ATTR file: 
D  [Job 977] Printer model: Ricoh Aficio MP C3003 PDF cups-team recommended
D  [Job 977] Job title: page.pdf
D  [Job 977] File(s) to be printed:
D  [Job 977] <STDIN>
D  [Job 977] Ghostscript extra search path ('GS_LIB'): /usr/share/cups/fonts
D  [Job 977] Printing system options:
D  [Job 977] Pondering option 'finishings=3'
D  [Job 977] Unknown option finishings=3.
D  [Job 977] Pondering option 'media='
D  [Job 977] mf: filter/foomatic-rip/options.c:486: option_find_choice: 
Assertion `opt && name' failed.
D  [Job 977] PID 12708 (/usr/lib/cups/filter/pdftopdf) exited with no errors.
D  [Job 977] PID 12709 (/usr/lib/cups/filter/foomatic-rip) crashed on signal 6.
D  [Job 977] PID 12710 (/usr/lib/cups/backend/socket) exited with no errors.
E  [Job 977] Job stopped due to filter errors; please consult the error_log 
file for details.
D  [Job 977] Unloading...

** Affects: cups-filters (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1479871

Title:
  foomatic-rip crashes if media is blank

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