disable parameter plot and download buttons if flight didn't have params
disable parameter plot and download buttons if flight didn't have params

Fix #3

diydrones/droneshare,diydrones/droneshare,PHELiOX/droneshare,PHELiOX/droneshare,PHELiOX/droneshare,dronekit/droneshare,SecureCloud-biz/droneshare,dronekit/droneshare,diydrones/droneshare,SecureCloud-biz/droneshare,SecureCloud-biz/droneshare,dronekit/droneshare