[Cuis-dev] Fix: Handling nil when there is an error creating a class

[Hernán Wilkinson]

Hi,
 the class builder can return nil when creating a class due to an error but
that case was not being handled by the message Class>>#subclass: t
instanceVariableNames: f classVariableNames: d poolDictionaries: s
category: cat

Attached is the fix

Hernan.

-- 

*Hernán WilkinsonAgile Software Development, Teaching & Coaching*
*Phone: +54-011*-4893-2057
*Twitter: @HernanWilkinson*
*site: http://www.10Pines.com <http://www.10pines.com/>*
Address: Alem 896, Floor 6, Buenos Aires, Argentina
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