Bug 905614 - [Unit tests] Failed: ClockView updateAnalogClock with type error.

https://bugzilla.mozilla.org/show_bug.cgi?id=905614

- Cannot repro test "failures"
- Added if statement to guard against [[Get]] property of undefined objects

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Merge pull request #11552 from rwaldron/905614

Bug 905614 - [Unit tests] Failed: ClockView updateAnalogClock with type error. r=kgrandon