Fix birthday setter (value can be null)
Fix birthday setter (value can be null)

udayinfy/ecommerce,filipjakubowski/ecommerce,Bladrak/ecommerce,Bladrak/ecommerce,sonata-project/ecommerce,sonata-project/ecommerce,filipjakubowski/ecommerce,Soullivaneuh/sonata-ecommerce,filipjakubowski/ecommerce,sonata-project/ecommerce,Soullivaneuh/sonata-ecommerce,sonata-project/ecommerce,udayinfy/ecommerce,udayinfy/ecommerce,Soullivaneuh/sonata-ecommerce,Soullivaneuh/sonata-ecommerce