Dion Hulse edcebaa160 Customize: Fix inability to delete nav menus by preventing preview filters from being added during customize_save admin ajax request.
Also prevent setting `nav_menu_locations[...]` values to `NaN` which gets sent as `null`.

Props westonruter.
See #30937, [38810].
Merges [39558] to the 4.7 branch.
Fixes #39103.


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