Fix _Hashtable extension

[Jonathan Wakely]

On 21/03/14 22:59 +0000, Jonathan Wakely wrote:
>On 21/03/14 22:39 +0100, François Dumont wrote:
>>   It is a really safe patch so I would propose it for current 
>>trunk but at the same time it only impacts a Standard extension and 
>>it hasn't been reported by anyone so just tell me when to apply it.
>
>As it doesn't fix a regression and apparently isn't affecting anyone I
>think it would be safer to add it to trunk after the 4.9 branch is
>created.

Actually, you're right, it's definitely safe and I'm being overly
cautious :-)  Please commit to the trunk, thanks!