[BUG]: UI gets crashed after backspace on time interval value

[pratibhapandey16]

What is the bug?
When user backspace on time interval value under Date Histogram UI gets crashed.

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to Observability/Event Analytics/Explorer page
2. Enter the query in PPL query section and select 'Year to date' option from calendar and click on 'Refresh'
3. Navigate to Visualizations page
4. Select Vertical bar chart from chart dropdown
5. Enter any value in interval section and hit backspace button
6. UI gets crashed.

What is the expected behavior?
The page should load properly.

@anirudha @mengweieric
cc: @abasatwar @spattnaik