Checking if a string is null

[Regan Heath]

Manfred Nowak wrote:
> Regan Heath wrote
> 
>> To steal Manfred's analogy and twist it to my own purposes.
> 
> You are clearly allowed to twist anything. But it is not necessary 
> and in this case may introduce confusion.
> 
> Sending no envelope is like sending a raw `null', which can represent 
> anything including the wish to send nothing.

I don't really want to get into a discussion of the analogy.  Suffice to 
say I prefer my interpretation of it.

Regan