fix: convert cell value before calling isURL method to avoid unexpected error

[pranavxc]

Change Summary

Provide summary of changes with issue number if any.

Change type

• feat: (new feature for the user, not a new feature for build script)
• fix: (bug fix for the user, not a fix to a build script)
• docs: (changes to the documentation)
• style: (formatting, missing semi colons, etc; no production code change)
• refactor: (refactoring production code, eg. renaming a variable)
• test: (adding missing tests, refactoring tests; no production code change)
• chore: (updating grunt tasks etc; no production code change)

Test/ Verification

Provide summary of changes.

Additional information / screenshots (optional)

Anything for maintainers to be made aware of

[dstala]

@wingkwong excel that was causing issue is attached along with
Untitled spreadsheet (6).xlsx

[github-actions]

Uffizzi Preview deployment-38423 was deleted.