Sheng Yang ab667cbc16 bug 13041: Fix potential NPE
I haven't figure out why the code can NPE, and in my test the clean up of basic
zone is prevent from API as expected. Anyway, I add this check before cleanup to
ensure even API check failed, no NPE would be throwed.

status 13041: resolved fixed.
2012-01-17 21:34:26 -08:00
..
2010-08-11 09:13:29 -07:00