CollectorNull should not set stack traces when stack stripping is enabled. Throwable.getStackTrace() already handles the case of a null stack trace and constructs an empty array.

Review at http://gwt-code-reviews.appspot.com/1355801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9726 8db76d5a-ed1c-0410-87a9-c151d255dfc7