Fix for menu helper build_menu method when ->classes is not an array #110
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While editing a menu within the Customizer, or after saving a Customizer draft, there were still cases where the
classes
property of a menu item could be an empty string within thebuild_menu
method of the menu helper.Some cases were caught by a previous PR, but not all. This PR should hopefully take care of the rest.
Note: This PR does still not address issue #105.
Fixes #109