Is your feature request related to a problem? Please describe.
Users are not informed when their search term yields no results, which can be confusing.

Describe the solution you'd like
Implement an error message that says, "There is no data for the provided search term" when the search yields no results. Currently, no message is displayed on the UI, and the backend find-sections and preview API calls return a 500 internal server error. Proper error messages should be displayed on the UI and in the API response. This feature will improve user experience by providing clear feedback when searches don't return data.

Additional context
This issue should be picked after the issues #75 and #76 are fixed

Acceptance criteria

1. When a search term yields no results, the message "There is no data for the provided search term" is displayed prominently on the page.
2. This message should be displayed instead of a 500 internal server error in the find-sections and preview API calls
3. This message should be displayed on the UI on clicking on Preview output or Download output.
4. The UI remains responsive, allowing users to modify their search terms and try again.
5. The error message is styled consistent with the rest of the application's UI.