subset_data: flanduse_timeseries missing from generated user_nl_clm

[samsrabin]

Brief summary of bug

When subsetting a landuse timeseries file with subset_data, the resulting user_nl_clm file doesn't have a line setting flanduse_timeseries.

General bug information

CTSM version you are using: Commit 4cbd405 on #3286 (up-to-date with ctsm5.3.056).

Does this bug cause significantly incorrect results in the model's science? Potentially?

Configurations affected: Cases created using subset_data output.

Important details of your setup / configuration so we can reproduce the bug

subset_data command:

tools/site_and_regional/subset_data point --lat 45.402252 --lon -92.798085 --create-surface --create-datm --datm-syr 1901 --datm-eyr 1901 --surf-year 1850 --create-user-mods --overwrite --outdir tmpout --user-mods-dir tmpout/user_mods

Important output or errors that show the problem

Resulting user_nl_clm file:

!----------------------------------------------------------------------------------
! Users should add all user specific namelist changes below in the form of
! namelist_var = new_namelist_value
!
! EXCEPTIONS:
! Set use_cndv           by the compset you use and the CLM_BLDNML_OPTS -dynamic_vegetation setting
! Set use_vichydro       by the compset you use and the CLM_BLDNML_OPTS -vichydro           setting
! Set use_cn             by the compset you use and CLM_BLDNML_OPTS -bgc  setting
! Set use_crop           by the compset you use and CLM_BLDNML_OPTS -crop setting
! Set spinup_state       by the CLM_BLDNML_OPTS -bgc_spinup      setting
! Set co2_ppmv           with CCSM_CO2_PPMV                      option
! Set fatmlndfrc         with LND_DOMAIN_PATH/LND_DOMAIN_FILE    options
! Set finidat            with RUN_REFCASE/RUN_REFDATE/RUN_REFTOD options for hybrid or branch cases
!                        (includes $inst_string for multi-ensemble cases)
!                        or with CLM_FORCE_COLDSTART to do a cold start
!                        or set it with an explicit filename here.
! Set maxpatch_glc       with GLC_NEC                            option
! Set glc_do_dynglacier  with GLC_TWO_WAY_COUPLING               env variable
!----------------------------------------------------------------------------------


fsurdat = '$CLM_USRDAT_DIR/surfdata_-92.798085_45.402252_hist_2000_16pfts_c250626.nc'

[samsrabin]

Sharp-eyed readers will notice that I forgot to include --create-landuse in my command there. Closing.