Support incoming null values for `Person.discoverable` (resolves #908)

What does this MR do?

Some instance software sends Person objects with the discoverable property set to null instead of a boolean value. This causes an exception when creating or updating the user, as Person.discoverable is mapped to user.explorable which does not allow nulls. We fix this by coercing the raw value to a boolean. (This is the same trick used for Person.hideOnlineStatus and Person.enableRss.)

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added bugbackend federation labels

requested review from @julia, @Marie, and @dakkar

changed title from Support incomming null values for Person.discoverable (resolves #908 (closed)) to Support incoming null values for Person.discoverable (resolves #908 (closed))

approved this merge request

approved this merge request

mentioned in commit 2d0bd012

merged