checking if a list is empty

[harrismh777]

Hans Georg Schaathun wrote:
> Code is quite often published to document algorithms, methods and
> formulæ for the purpose of scientific research.  Since there is no
> universal language which suits everything and everyone, this
> is exactly what happens.  One has to have the rudimentary knowledge
> to read half a dozen different languages to be able to read the
> code and extract the algorithms.

+1  QOTW