minor fix

erpnext/setup/utils.py

@@ -120,6 +120,7 @@ def enable_all_roles_and_domains():
 		_role.save()
 
 	# add all roles to users
+	if roles:
 		user = frappe.get_doc("User", "Administrator")
 		user.add_roles(*[role.get("name") for role in roles])