Number input returns empty value when user enters `Dot`

[jaikumar-tj]

Describe the bug

When user enters decimal numbers eg: 1.5, the onChange callback of NumberInput component intermittently returns empty value.

This is causing issue for Set-number fields which was implemented in MC-frontend (experimental component). The Set fields works based on total number of values present and ignoring any empty values. When the user inputs . (dot) then the onChange returns empty value which is causing the Number input in the UI to disappear.

https://commercetools.atlassian.net/browse/PDM-5

JFYI: @bradd123 & @ismaelocaramelo have some ideas for how it could be done by UI Kit.

Steps To Reproduce

• Goto product detail page which has set-number (eg: Attribute SET-NUMBER SameForAll )
• Click on the plus icon to add a new number input
• Enter a floating number with dot (eg: 2.5)
• Notice the newly added number input disappeared

Expected behavior

• If possible, I would expect the onChange to return the dot along with number 1.
• If that is not possible then it would be better if we append zero and return 1.0
• If you have any other solution to this issues, please let me know.