[bugfix] {DataSource} empty numeric values became 0 and could not be cleaned

[AntoineYANG]

In csv-like files, empty values are read as empty strings "". Here was a bug that validation check of numeric values (quantitative or ordinal) got bypassed because the values were transformed into 0s. Prevent using Number() to transform an unknown object until you're sure that it is not "" or null because the trap where

Number("");          // 0
isNaN(Number(""));   // false
Number(null);        // 0
isNaN(Number(null)); // false

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Name	Status	Preview	Updated
rath	✅ Ready (Inspect)	Visit Preview	Dec 19, 2022 at 9:35AM (UTC)