fixed null contains nested object error.

[alu]

Fixed null contains nested object error. I meet error code below.

ko.track({ key: null }, { deep, true });

output

TypeError: limb is null
trackDeep/<()knockout-es5.js (94 行目)
trackDeep()knockout-es5.js (90 行目)
track()knockout-es5.js (63 行目)


(('Object' === getFunctionName(limb.constructor)

[archangel-irk]

Thank you for your bug report, the changes will be merged manually.

[archangel-irk]

was fixed in #38

test added 916f251