Expected Behavior

Undefined properties should be treated as empty string

Actual Behavior

When sorting a column, items are not re-ordered as expected if an item in the table has the property set to null or undefined

URL, screen shot, or Codepen exhibiting the issue

See Codesandbox

Steps to Reproduce

On Code sandbox - sort by Parent_id

Your Environment

• Grommet version: 2.23.0, also reproducible w/ 2.25.1
• Browser Name and version: Chrome Version 104.0.5112.79 (Official Build) (x86_64)
• Operating System and version (desktop or mobile): NA