Fix: Prevent app crash when external CSV is empty in ThankYouNote

[madhuri-perumalla]

Problem

The ThankYouNote component was directly accessing parsed CSV data without checking if it exists:

    setThankYou(Papa.parse(response.data)?.data[1]);

----> If the CSV is empty or only contains headers, data[1] becomes undefined.
----> This later causes runtime errors when the code tries to access values like undefined[6].

Fixes

Added a validation step to ensure the parsed data exists and contains at least one data row before setting the state:

    const parsedData = Papa.parse(response.data);

    if (Array.isArray(parsedData?.data) && parsedData.data.length > 1) {
        setThankYou(parsedData.data[1]);
    }

Result

  ✔ Prevents crashes when the CSV is empty or malformed
  ✔ Ensures the component only uses valid data
  ✔ Keeps the UI stable even when external data is missing