Bug report
Data validation should not require DATEVALUE("") in Start and End inputs when `Date` is selected
Reproduction of the problem
https://demos.telerik.com/kendo-ui/spreadsheet/index
1. Select an empty cell
2. Click Data validation
3. Set Start: DATEVALUE("1/1/2024") and End: DATEVALUE("2/2/2025")
4. Automatic Hint message looks like: between DATEVALUE("1/1/2024") and End: DATEVALUE("2/2/2025")
Expected
Generated hint message shall not contain DATEVALUE("")
Environment
**Kendo UI version: [all]
**Browser: [all]