Exchange 2010 Dynamic Disclaimers

Question

Hello all,

I am coming up with a standard signature for a client pulling AD values using the Disclaimer action for the Transport Rule. It is simple to add html and AD tokens using the following syntax:

%%DisplayName%%<br/>

My question is given I am not allowed to use any 3rd party components and must be server side solution is there any way to determine if an AD attribute has a value and if not do not generate the line item for Example,

Pseudo Code

If (%%DisplayName%% != "")
{
     %%DisplayName%%<br/>
}

Thanks for your consideration