UFontBulkData::Serialize can be called in cases other than loading (such as memory counting) which can incorrectly set the BULKDATA_SingleUse on fonts that weren't loaded from a package, and lead to a crash.

Steps to Reproduce

See linked bug.

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Affects Versions4.13
Target Fix4.13
Fix Commit3077999
Main Commit3082411
Release Commit3078009
CreatedAug 4, 2016
ResolvedAug 4, 2016
UpdatedMay 2, 2018
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