Jeremy Felt 52c3be1602 Multisite: Add action to handle network not found
`ms_network_not_found` fires when the global `$current_site` has not been filled and `ms_not_installed()` is about to fire. It cannot be used to populate `$current_site`, but can be used to capture the request and redirect or present a custom error.

Props rmccue.
Fixes .

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