Text containing only one delimiter is detected as empty front matter

[Johan Preynat]

I have a file with the following content:

---

When running it through gray-matter, or use gm.test(content), it is detected as empty front matter.
It seems like an issue since both delimiters should be present to have a "valid" front matter.

[Johan Preynat]

Actually, the issue seems worst than only that:

gm.test('---\nSome text');
// true

gm('---\nSome text');
// { content: '', data: 'Some text', isEmpty: false, excerpt: '' }