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The answer I got is this:

[blockquote]Hello,

The Grid use native WordPress title and name fields. We also use native metadata fields to store all options. Nothing is undefined when a grid is saved. Isset and empty are two different things. A filed can be empty but definied in WordPress. The result is not the same.

In WordPress when you save a post/page with metadata, even if the field is empty for a metadata then it’s set and definied to empty. WordPress do not ignore metadata since it’s a part of the core functionnality: https://codex.wordpress.org/Metadata_API

Themeone[/blockquote]

Does this help? Any further questions?