ldb bug fixes

[Volker Lendecke]

On Tue, Nov 24, 2015 at 09:15:36AM +1300, Adrian Cochrane wrote:
> I am not aware of anywhere outside this function (which specifically
> errors out in the NULL case) that would have a problem with
> msg->elements being NULL. I'll send another variant of the patch
> shortly which sets msg->elements to that if it will please you.

I'm asking because you have a special if-clause for num_elements==0 to
make sure that in that case msg->elements!=NULL. I would like to know
why this is necessary.

Thanks,

Volker

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