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I had the XSL module disabled (don't like to have httpserver on). I right-clicked openide/api/doc/changes/apichanges.xml and selected Edit Scenarios... and an NPE was thrown. After enabling the XSL module, this just gave a dialog box saying "no scenario types registered for this file type" without throwing an exception. (Not sure what the dialog box *means* but at least it does not look like an error.)
Created attachment 7839 [details] Stack trace (not actually an NPE, sorry, but close)
*** This issue has been marked as a duplicate of 30190 ***
VERIFIED