Display List of Products With Missing Attribute?

The Admin Columns Pro plugin would let you do this without any custom code. You would modify the ‘All Products’ list screen by adding a column for the attribute in question. Then you would filter the list for all products for which the pa_sort-chassis is not set.

This plugin is indispensible, especially for WooCommerce admin screens.

The plugin also supports inline editing from the list screen as well as BULK editing from the list screen.

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