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go-rendezvous's Issues

Lookup panics when there are no nodes 

package main

import (
	"github.com/cespare/xxhash"
	"github.com/dgryski/go-rendezvous"
)

func main() {
	r := rendezvous.New([]string{}, xxhash.Sum64String)
	r.Lookup("hello")
}
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
github.com/dgryski/go-rendezvous.(*Rendezvous).Lookup(0xc00010a000, 0x4a0582, 0x5, 0x4a6870, 0xc00010a000)
	/home/vmihailenco/gocode/pkg/mod/github.com/dgryski/[email protected]/rdv.go:33 +0x145

https://github.com/golang/groupcache/blob/master/consistenthash/consistenthash.go#L66-L68 returns empty string in such case.

License!

Hey @dgryski! This lovely tiny package doesn't have a license, and it has been added as a dependency on go-redis: redis/go-redis#1361

Could you please add a license so we can tick some compliance checkboxes? Thank you!

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