Failure to load an empty inline table

[x-hgg-x]

Describe the bug
Loading produces an error:

loading error: (1, 8): unexpected token type in inline table: keys cannot contain } character

To Reproduce

_, err := toml.Load("key = {}")
if err != nil {
	fmt.Println("loading error:", err)
}

Expected behavior
There should be no error according to the TOML specification:

Within the braces, zero or more comma separated key/value pairs may appear.

Versions

• go-toml: last version of master (2b8e33f)
• go: 1.14
• operating system: Linux

Additional context
None.