Code hardening to deal with null/undefined files object #69
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If the files object is set to null/undefined, the call to .map throws an unhanded exception, but it shouldn't be called anyway if files isn't a valid array. This patch accounts for that possibility.
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As part of a form reset, I had set my bound files object to be null. This code assumed files to be a valid array (which would then have .map() on it) so I added logic to short-circuit onFileChanged() if files is null/undefined or doesn't have .map on it.