CMS_EMIS option broken in CO2 grid comp

[bena-nasa]

I was attempting to debug an issue raised by Leslie Ott with MAPL:
GEOS-ESM/MAPL#327
when exercising the CMS_EMIS: 1 option to CO2_GridComp.
This appears to be broken in the latest version of the GESOgcm I pulled from git (version 10.12.2).
I did this experiment, I requested the OPS gocart because MERRA2 does not exercise CO2. I turned off every GOCART component except CO2 and tried to run. I had to move the time back to before 2016 as the files this option end at 2015:
/gpfsm/dnb52/projects/p10/gmao_ops/fvInput/AeroCom/sfc/CMS
are only defined for 1999 to 2015
However the ExData.rc files in the main CO2_GridComp_ExtData.rc as well as all the other "options" there appears to be a bug.
All the /gpfsm/dnb52/projects/p10/gmao_ops/fvInput/AeroCom/sfc/CMS/NOBM_fco2.daily.1x1.25.%y4.nc files have a single variable named fco2 but in all the ExtData.rc files it has asking for emco2ocn which of course throws an error as that is not the name in the file.