70_HR_FIX of issue #196632

http://netbeans.org/bugzilla/show_bug.cgi?id=196537

fix: http://hg.netbeans.org/web-main/rev/758b20711e22

Bug 196632 - Unknown attribute breaks other editor functionality

Description: Html validator issues should be reported as warnings only 
since the browsers renders and process such files w/o problems in most 
cases. Another consequence is that the code folding is disabled when 
there are errors in the file which in the case of html is not necessary 
since the file structure reflected by the folds is usually fine.

Justification: It seems to be annoying to users that the files they 
consider as ok are marked as erroneous. Missing folding most of the 
real-word files.

Risk: minimal

Verified by the reporter. QE has been asked to verify as well.