Working with template holders “{some_content}”

[Miky]

I use redshop for joomla, this system works with templates, for example, if i create a new custom field, i can call it so:

{rs_product_functionalitis} 

I have see also redshop has a if function and they get so:

{if product_userfield}{rs_product_functionalitis}{product_userfield end if} 

I have tried to work with label, for example so:

{if product_userfield} - this comes with redshop

{if product_userfield}<div>Product functionalitis: </div><div>{rs_product_functionalitis}</div>{product_userfield end if} 

I have read this: http://redcomponent.com/redcomponent-support/kb/article/use-of-custom-fields-in-redshop  and redShop wiki, but i can't anything found about this issue...

My problem is, i mean, if i add this if statement then if this custom field is empty then this label "Product functionalitis:" and there div's shouldn't be visible, how can i do true if statement?