Fix --no_viewer option breaking

[tomvothecoder]

Description

• Closes [Bug]: error with --no-viewer argument in rc3.0.0.rc3 #942
• Example: https://web.lcrc.anl.gov/public/e3sm/cdat-migration-fy24/942-no-viewer/
• Example log

2025-02-18 16:39:47,976 [INFO]: e3sm_diags_driver.py(_log_diagnostic_run_info:523) >> 
================================================================================
E3SM Diagnostics Run
--------------------
Timestamp: 2025-02-18 16:39:47
Version Info: branch bug/942-no-viewer with commit eb1a96e683bdab67d9bd420f4dadf2591d451c98
Results Path: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer
Log Path: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/prov/e3sm_diags_run.log
Parameter Files Path: N/A (No viewer generated)
Python Script Path: N/A (No viewer generated)
Environment YML Path: N/A (No viewer generated)
Provenance Index HTML Path: N/A (No viewer generated)
================================================================================

2025-02-18 16:39:52,525 [INFO]: lat_lon_driver.py(run_diag:69) >> Variable: TREFHT
2025-02-18 16:39:54,208 [INFO]: dataset_xr.py(_get_dataset_with_derived_climo_var:713) >> Deriving the test climatology variable using the source variables: ('TREFHT',)
2025-02-18 16:39:54,676 [INFO]: dataset_xr.py(_get_dataset_with_derived_climo_var:713) >> Deriving the ref climatology variable using the source variables: ('tas',)
2025-02-18 16:39:56,547 [INFO]: regrid.py(subset_and_align_datasets:70) >> Selected region: land
2025-02-18 16:40:45,476 [INFO]: io.py(_write_to_netcdf:151) >> 'TREFHT' test variable output saved in: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/lat_lon/ERA5/ERA5-TREFHT-ANN-land_test.nc
2025-02-18 16:40:45,482 [INFO]: io.py(_write_to_netcdf:151) >> 'TREFHT' ref variable output saved in: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/lat_lon/ERA5/ERA5-TREFHT-ANN-land_ref.nc
2025-02-18 16:40:45,487 [INFO]: io.py(_write_to_netcdf:151) >> 'TREFHT' diff variable output saved in: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/lat_lon/ERA5/ERA5-TREFHT-ANN-land_diff.nc
2025-02-18 16:40:45,489 [INFO]: io.py(_save_data_metrics_and_plots:77) >> Metrics saved in /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/lat_lon/ERA5/ERA5-TREFHT-ANN-land.json
2025-02-18 16:40:45,536 [WARNING]: warnings.py(_showwarnmsg:112) >> /home/ac.tvo/miniforge3/envs/e3sm_diags_dev_930/lib/python3.12/site-packages/cartopy/mpl/geoaxes.py:856: UserWarning: Attempting to set identical low and high xlims makes transformation singular; automatically expanding.
  self.set_xlim([x1, x2])

2025-02-18 16:40:46,049 [WARNING]: warnings.py(_showwarnmsg:112) >> /home/ac.tvo/miniforge3/envs/e3sm_diags_dev_930/lib/python3.12/site-packages/cartopy/mpl/geoaxes.py:856: UserWarning: Attempting to set identical low and high xlims makes transformation singular; automatically expanding.
  self.set_xlim([x1, x2])

2025-02-18 16:40:48,733 [WARNING]: warnings.py(_showwarnmsg:112) >> /home/ac.tvo/miniforge3/envs/e3sm_diags_dev_930/lib/python3.12/site-packages/cartopy/mpl/geoaxes.py:856: UserWarning: Attempting to set identical low and high xlims makes transformation singular; automatically expanding.
  self.set_xlim([x1, x2])

2025-02-18 16:40:53,335 [INFO]: utils.py(_save_plot:92) >> Plot saved in: /lcrc/group/e3sm/public_html/cdat-migration-fy24/942-no-viewer/lat_lon/ERA5/ERA5-TREFHT-ANN-land.png
2025-02-18 16:40:53,412 [INFO]: e3sm_diags_driver.py(main:438) >> Viewer not created because the no_viewer parameter is True.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)