[enhancement request] option to hide null feilds in <f:display bean="user" />

[nutmix]

<f:display bean="xxx"> is great. However if its a big domain object (such as user with perhaps 20 nullable fields), it would be fantastic to have an option to not display all the null ones.

e.g.

<f:display bean="xxx" hideNull="true">

This one addition would save us hundreds of additional lines of code doing each field by hand.