regionator does not handle invalid geometries
---------------------------------------------

                 Key: GEOS-2446
                 URL: http://jira.codehaus.org/browse/GEOS-2446
             Project: GeoServer
          Issue Type: Improvement
          Components: Google Earth KML Output
            Reporter: Justin Deoliveira
            Assignee: David Winslow
             Fix For: 1.7.1
         Attachments: ExternalSortRegionatingStrategy.java.patch

the regionating chokes on invalid geometries b/c it relies on being able to 
robustly calculate the centroid which is not always possible. What happens is 
from what i can tell it bombs out leaving the hierachy uncalculated as soon as 
it hits in the invalid geometry and nothing really shows up in google earth.

I have attached a patch but i am really not familiar with this part of the code 
base so my confidence in it is minimal.

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