recover from CSS syntax errors

[Dirk Mueller]

Hi, 

Recently we've had a couple of bug reports caused by syntax errors in CSS 
declarations, which caused the bison parser to not recover correctly and 
therefore discard valid declarations or even rulesets. 

I've noticed that you've added a couple of very special quirks to your 
parser.y to workaround specific errors you found. That was not too usable, 
therefore I wrote generic fix instead.

Would be nice if you could give it a regression test in your suite even when 
you don't merge the actual patch. 


Thanks in advance, 

Dirk
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