$ spread -v -reuse -resend -list qemu:ubuntu-16.04-64:tests/completion/...
2017-04-05 13:47:58 Found /home/john/canonical/snappy/src/github.com/snapcore/snapd/spread.yaml.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x6d0072]

goroutine 1 [running]:
panic(0x738be0, 0x921560)
	/home/niemeyer/src/go/src/runtime/panic.go:531 +0x1cf
github.com/snapcore/spread/spread.Load(0x79253b, 0x1, 0x1, 0x8f9f20, 0xc4200d3d20)
	/home/niemeyer/src/github.com/snapcore/spread/spread/project.go:594 +0xdb2
main.run(0x79c8e9, 0x0)
	/home/niemeyer/src/github.com/snapcore/spread/cmd/spread/main.go:97 +0x334
main.main()
	/home/niemeyer/src/github.com/snapcore/spread/cmd/spread/main.go:38 +0x26