Unmarshal of empty input should return empty map

[moorereason]

Describe the bug
An empty input currently results in a <nil> result when unmarshaled into interface{}.

To Reproduce
https://play.golang.org/p/qYCSR7Hrjc3

var v interface{}
toml.Unmarshal([]byte(""), &v)

Expected behavior
According to this toml-lang/toml issue, it should result in an empty map (BurntSushi returns an empty map[string]interface{}).

Versions

• go-toml: v2 ee9b902
• go version devel go1.18-113da92ab63 Mon Sep 20 18:11:57 2021 -0400 linux/amd64

[pelletier]

Nice edge case, probably comes from the strategy of trying to allocate as little as necessary. Thanks!

[pelletier]

Fixed inhttps://github.com/pelletier/go-toml/commit/64941b99e2bfbaf6f1c1fcfefd51d055beaafcbf