[ic] Patch to differentiate between free shipping and unavailable shipping methods

[Mark Lipscombe]

Hi,

Here is a small patch which lets Vend::Ship::shipping return undefined 
when a cost cannot be calculated for shipping.  This allows ITL code 
like this:

[either][shipping][or]Not enough info[/either]

This allows you to have free shipping options, but not show them if a 
shipping calculation cannot be done (for example if that shipping method 
isn't available to that location).

It applies cleanly against CVS HEAD, and also applies with fuzz to 5.4 
and 5.6 versions of IC.

Regards,
Mark
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