Improve Error Handling in GetOJS Function

- Enhanced the GetOJS function to include error handling for reading the response body and parsing CSV records, ensuring that errors are properly returned instead of being ignored.
- Added a check to ensure that the CSV records contain data, returning a meaningful error if the calendar is empty, which improves robustness and clarity in error reporting.

ted/calendar.go

@@ -27,9 +27,20 @@ func GetOJS(baseURL string, year int, date string) (string, error) {
 	defer resp.Body.Close()
 
 	// read CSV
-	body, _ := io.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return ojs, err
+	}
+
 	reader := csv.NewReader(bytes.NewReader(body))
-	records, _ := reader.ReadAll()
+	records, err := reader.ReadAll()
+	if err != nil {
+		return ojs, err
+	}
+
+	if len(records) < 2 {
+		return ojs, fmt.Errorf("ojs calendar is empty")
+	}
 
 	for _, row := range records[1:] {
 		rowDate := strings.TrimSpace(row[1])