### What?
This PR fixes an issue where empty array fields would return `0` instead
of an empty array `[]` in form state.
The issue was caused by `rows` being initialized as `undefined` within
the array field reducer.
As a result, `rows` did not exist on array field state when initial
state was empty.
This has been updated to initialize as an empty array (`rows: []`) to
ensure consistent behavior when using `getDataByPath`.
Fixes#10712
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