Failed update HA from terminal and web interface

Hi all,

I am new in this community, I hope I can find issue and provide help using my little knowledge of HA.

I am trying to update ha from 0.70.0 to the last release but I was not successful.

I think something has been moved from the server, it seems that hassio is not able to find the update at the specified link present into the script. Here below my error:

core-ssh:~# hassio -d ha update
DEBUG [CmdHomeassistant]: action->'update', endpoint='update', serverOverride->'', GET->'false', options->'', rawjson->'false', filter->''
DEBUG [ExecCommand]: basepath->'homeassistant', endpoint->'update', serverOverride->'', get->'false', Options->'', Filter->'', RawJSON->'false'
DEBUG [GenerateURI]: basepath->'homeassistant', endpoint->'update', serverOverride->''
DEBUG [RestCall]: data->'xxx://hassio/homeassistant/update', GET->'false', payload->''
DEBUG [RestCall]: ResponseBody->'{"result": "error", "message": null}'
ERROR
panic: interface conversion: interface is nil, not string

goroutine 1 [running]:
panic(0x2c7050, 0x107ac380)
        /home/travis/.gimme/versions/go1.7.6.linux.amd64/src/runtime/panic.go:500 +0x33c
github.com/home-assistant/hassio-cli/command/helpers.DisplayOutput(0x107b6200, 0x24, 0x200, 0x0)
        /home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/helpers/common.go:118 +0x3c8
github.com/home-assistant/hassio-cli/command/helpers.ExecCommand(0x2f6f83, 0xd, 0x7e86ee39, 0x6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/helpers/common.go:155 +0x308
github.com/home-assistant/hassio-cli/command.CmdHomeassistant(0x10778420)
        /home/travis/gopath/src/github.com/home-assistant/hassio-cli/command/homeassistant.go:48 +0x540
github.com/urfave/cli.HandleAction(0x2af768, 0x324b14, 0x10778420, 0x0, 0x0)
        /home/travis/gopath/src/github.com/urfave/cli/app.go:503 +0xf0
github.com/urfave/cli.Command.Run(0x2f6f83, 0xd, 0x0, 0x0, 0x40bd10, 0x1, 0x1, 0x301e4d, 0x2f, 0x0, ...)
        /home/travis/gopath/src/github.com/urfave/cli/command.go:165 +0x6b8
github.com/urfave/cli.(*App).Run(0x107668c0, 0x1070a120, 0x4, 0x4, 0x0, 0x0)
        /home/travis/gopath/src/github.com/urfave/cli/app.go:259 +0x8b0
main.main()
        /home/travis/gopath/src/github.com/home-assistant/hassio-cli/main.go:22 +0x108
core-ssh:~#

Could you please help me in finding the issue?

I have replaced http with xxx for the forum policy (max two links per post)