Bug 924307 - Intermittent "reporter is null at abouthealth.js:27"; r=rnewman

The error message comes from abouthealth.js not checking if a variable
is null before access. That bug is fixed.

However, the underlying issue of "the reporter is null" still remains.
Logging has been added to hopefully catch issues. The signature of the
failure will change.

--HG--
extra : rebase_source : bc887406a3570a767bae5407b5836314157ac421
extra : amend_source : f22cad2eae46bd08ae25a7d376fbf8e2d1d0ea92