Krzysztof Kotlarek 5c43f9a3a3
FIX: problem when [] custom field is send (#13573)
Multiselect data can be saved but when all are removed then data are not cleared

Ajax function is removing an empty array from request data. In that case, we should change `[]` to `null`.

We need that empty values to properly empty data.
2021-06-30 16:18:37 +10:00
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