Minor bug with plone.session and old style plone.css script

Hi all,

I found a minor issue when you call the old style "plone.css" script
and you also have the plone.session product activated.

The problem is related to the fake CSS generated by the product, this
will make the plone.css call to a NotFound error.

The fix I want to provide is simple: try/except/pass the NotFound
error imported by zExceptions and in my tests this is working.

Any opposition about this approach? I'm asking because I want to skip
the multi-pull-request on every branches we have on Products.CMPlone
:)

BTW: where I can apply this? branch 4.2.x, 4.3.x, ... and? I also wee
a 4.4.x (???) and the master (but for what I know master/plone 5 will
drop CMF skins resources, right?)

-- 
-- luca

twitter: http://twitter.com/keul
linkedin: http://linkedin.com/in/lucafbb
blog: http://blog.keul.it/

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