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Problems with -chem none option

I would like to set up an F-compset (prescribed SST) experiment where I disable the aerosol model and prescribe all aerosol concentrations. Using CESM release 1_0_3, this was achieved quickly by adding a user-defined compset and modifying CAM_CONFIG_OPTS to include the "-chem none" flag. Repeating the exact same procedure in the latest release 1_1 still successfully builds the model but generates the following run-time error in the cesm.log.* file:

ENDRUN:init_modes ERROR: cannot find physics buffer field num_a1

By comparing the CAM namelists produced using the 1_0_3 and 1_1 versions, I noticed that the latter seemed to include a lot more aerosol input files making me suspect that it ignored the "-chem none" flag. One thing I noticed is the config_compset.xml script was modified quite a bit so now it's not clear when the "-chem none" should be specified.

Can anyone offer any advice on how to turn off the aerosol model in the latest CESM1_1 release?
 
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