in the Zoho creator i have address field based the customer lookup im selecting the addresss , some times the customer address getting as null i want to show as blank

in the Zoho creator i have address field based the customer lookup im selecting the addresss , some times the customer address getting as null i want to show as blank

in the Zoho creator  i  have address field  based the customer lookup im selecting the addresss , some times the customer address getting as null  ,i want to show as blank instead of showing null. 

input.Billing_Address.address_line_1 = ifNUll(input.Customers_Name.Address.address_line_1,"");
input.Billing_Address.district_city = ifNull(input.Customers_Name.Address.district_city,"");
input.Billing_Address.country = ifNull(input.Customers_Name.Address.country,"");
input.Billing_Address.postal_Code = ifNull(input.Customers_Name.Address.postal_Code,"");
input.Billing_Address.state_province = ifNull(input.Customers_Name.Address.state_province,"");
input.Select_Currency = ifNull(input.Customers_Name.Default_Currency,"");