This only impacts test_x_full_script.py, not the actual script.
df_nara_risk.fillna('BLANK', inplace=True)
df_tech_appraisal.fillna('BLANK', inplace=True)
df_multiple_ids.fillna('BLANK', inplace=True)
df_validation.fillna('BLANK', inplace=True)
Check the hub audit script for how I solved this before.