Let AtFork ignore unregistration of nullptr objects
Summary: [Folly] Let `AtFork` ignore unregistration of `nullptr` objects - i.e., let `nullptr` objects be the way of signaling immunity from unregistration. Reviewed By: luciang Differential Revision: D19207380 fbshipit-source-id: 6dfee52bf815fc257697fb89d67f69cede0f39f6
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