catching invalid import statements

[Stephan Kulow]

Hi!

When I read the layout-tests's expected.txt Safari shares the bug of konqueror
in displaying http://www.w3.org/Style/CSS/Test/CSS1/current/test11.htm

The last sentense saying "This paragraph should be green." is displayed in 
black as the css parser doesn't recover from the IMPORT_SYM. The css
specs say that the user agent has to ignore import rules appearing somewhere
else than at the beginning.

The attached patch tries to catch that. I had to increase the number of 
expected conflicts, but for this case, the reduce preference is the right 
choice.

Greetings, Stephan
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