import frappe


def execute():
	if frappe.db.has_table("Tax Withholding Category") \
		and frappe.db.has_column("Tax Withholding Category", "round_off_tax_amount"):
		frappe.db.sql("""
			UPDATE `tabTax Withholding Category` set round_off_tax_amount = 0
			WHERE round_off_tax_amount IS NULL
		""")