Simplistic fix for initialization race

The monkey run described in the bug report hits this server at a
vulnerable point, and the RuntimeException causes a subsequent NPE.

Note that I'm making this fixup CL "blind", as monkey running on
my platform (mantaray) doesn't show this specific failure.

http://b/9438025

Change-Id: I8e16cf5cfc21dcf3061f31b0741525881bbf9724