I' trying the following code to catch instance when the extender is not available - however "ext1 == null" is never true even when there's no network connection or no extender on the network.

var ext1 = CF.extender[1];
if (ext1 == null)
{System.print("couldnt get the extender");}
else
{rest of code assuming extender is available}

What's the best way to catch instance where extender is not available, so you don't execute any further code which will error when extender doesn't respond?