grouped fields show Empty cells when group is used in Datasources with Linear data

[srinath999]

The Environment Created here is inspired from issue #84

Bug Report

When a user tries to create a dropdown with grouping. The control renders each option as a blank field.

Package versions: Package.json

Code Sample: Code

Steps to reproduce: Please run this code to find images below

Expected behavior: grouping should be performed and display fields as per groups.

Screenshots:

image for dropdown which did not work

image for dropdown which worked