Breaks when entering "inputs"

[pmf-ids]

When calling jiq with

echo 1 | jiq -n

it opens up fine, displaying

[jq]> .

1

with the cursor being next to the dot. Clearing the dot and entering inputs makes jiq crash as soon as the last letter s is hit, with the message

panic: runtime error: slice bounds out of range [:-1]

goroutine 1 [running]:
github.com/fiatjaf/jiq.(*Engine).makeCandidates(0xc0001d2000)
	/home/fiatjaf/comp/jiq/engine.go:212 +0x585
github.com/fiatjaf/jiq.(*Engine).Run(0xc0001d2000, 0x0)
	/home/fiatjaf/comp/jiq/engine.go:70 +0x165
main.run(0xc0001d2000, 0xc00000e000, 0xc000010050)
	/home/fiatjaf/comp/jiq/cmd/jiq/jiq.go:59 +0x32
main.main()
	/home/fiatjaf/comp/jiq/cmd/jiq/jiq.go:55 +0x18d

Tested on jiq version 0.7.1-3-g5dec899