pidgin/pidgin

facebook: Make $.hugePictureUrl.uri optional

2016-10-22, dequis
69b44723d52c
facebook: Make $.hugePictureUrl.uri optional

Facebook seems to randomly send null in this field sometimes. It's not
very important so it can be made optional.

This includes moving the checksum code (which was previously duplicated)
to a separate function so that there's a single null check.
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