[eigen] Zero-Sized Blocks

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

is it intended that fixed sized blocks can't have 0 rows or 0 columns 
(while dynamic-sized can)?
It's hard to explain a useful use-case without much context, but it 
allows me to reduce code-duplication (resulting essentially in a NOP for 
the 0 case).
The fix is actually just to relax an assertion in Block.h

I don't see anything that could go wrong with that (and in other places 
fixed size 0 is allowed, e.g. Matrix<double, 0, 1>), but I don't dare to 
commit that without asking first.

Christoph


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Dipl.-Inf., Dipl.-Math. Christoph Hertzberg
Cartesium 0.049
Universität Bremen
Enrique-Schmidt-Straße 5
28359 Bremen

Tel: +49 (421) 218-64252
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