AutoUI: Fix empty string values being converted to null when passed into widgets

[myarmolinsky]

AutoUI: Fix empty string values being converted to null when passed into widgets

Change-type: patch Signed-off-by: Matthew Yarmolinsky matthew-timothy@balena.io

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Contributor checklist

• [ ] I have regenerated jest snapshots for any affected components with npm run generate-snapshots

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[myarmolinsky]

@balena-ci I self certify!