[Templates] unable to set empty hash key

[Andy Wardley]

Yitzchak Scott-Thoennes wrote:
> A hash can be initialized with an empty key, but trying to
> change or add it afterwards has no effect:

Hi Yitzchak,

Yes, you're right.  Specifically, it's a bug in the XS Stash, but
not the Perl one.  It's a simple fix - now applied and checked in to
SVN.

http://template-toolkit.org/svnweb/Template2/revision?rev=1102

Cheers
A