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Kris Shannon 52fc48b3e9 Protect against cache lookup returning null
If the cache file does not exist _cacheGetJson will not pass any value to the callback.

In the getImage function the callback passed to _cacheGetJson assumes if there was no error value then the second argument must be an array.

Add some logic to guard against null values before iterating over the array.
2016-02-15 03:58:29 +11:00
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