Fails on empty lists or objects

[bastianbowe2000]

$ echo '{}'|jiq
panic: runtime error: index out of range

goroutine 1 [running]:
github.com/fiatjaf/jiq.(*Engine).makeCandidates(0xc4200ae000)
	/home/babowe/go/src/github.com/fiatjaf/jiq/engine.go:195 +0x56c
github.com/fiatjaf/jiq.(*Engine).Run(0xc4200ae000, 0x0)
	/home/babowe/go/src/github.com/fiatjaf/jiq/engine.go:70 +0x13e
main.run(0xc4200ae000, 0xc42000c000, 0xc42000e1b0)
	/home/babowe/go/src/github.com/fiatjaf/jiq/cmd/jiq/jiq.go:53 +0x2f
main.main()
	/home/babowe/go/src/github.com/fiatjaf/jiq/cmd/jiq/jiq.go:49 +0x22f

[aesyondu]

$ echo '[]' | jiq

panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
github.com/fiatjaf/jiq.(*Engine).makeCandidates(0xc0000d2000)
	/Users/aes/go/src/github.com/fiatjaf/jiq/engine.go:201 +0x560
github.com/fiatjaf/jiq.(*Engine).Run(0xc0000d2000, 0x0)
	/Users/aes/go/src/github.com/fiatjaf/jiq/engine.go:70 +0x118
main.run(0xc0000d2000, 0xc00008c000, 0xc000092010)
	/Users/aes/go/src/github.com/fiatjaf/jiq/cmd/jiq/jiq.go:53 +0x32
main.main()
	/Users/aes/go/src/github.com/fiatjaf/jiq/cmd/jiq/jiq.go:49 +0x14b

I guess fixing this simple bug would be a good excuse to learn go?

[fiatjaf]

Probably not, too irrelevant, and yet confusing.

Fixed in b24f06f