Fix WiggleParser so addData works properly for all file types
Fix WiggleParser so addData works properly for all file types

IGV-1875

igvteam/igv,godotgildor/igv,amwenger/igv,godotgildor/igv,amwenger/igv,itenente/igv,godotgildor/igv,godotgildor/igv,itenente/igv,amwenger/igv,igvteam/igv,amwenger/igv,itenente/igv,igvteam/igv,igvteam/igv,itenente/igv,godotgildor/igv,amwenger/igv,itenente/igv,igvteam/igv