fix error on folder without any md file

[nweldev]

if a directory only has subdirectories, a TypeError (link.children[0] || "").split is not a function was raised

[ozum]

Thanks, I'll update npm in a few minutes.

[ozum]

@noelmace, I had to reverse this commit, because it failed a test.

Could you please examine docs/example-missing-readme and related test. It passes when there is no md in folder.

Could you please create a new failing test for your case and create a PR solving it.

Thanks again.

[nweldev]

Hi ozum. If I understand correctly, you're talking about "should throw for missing README.md in Navbar", which was already failing before. I just ran npm run test on 611b4fb just to be sure : Yet, this PR still introduced a regression, as it broke "sort file and folder by prefix" :

getConfig › sort file and folder by prefix

    expect(received).toEqual(expected) // deep equality

    - Expected
    + Received

    @@ -1,16 +1,16 @@
      Object {
        "nav": Array [],
        "sidebar": Array [
          "01-file",
    +     "03-file",
          Object {
            "children": Array [
              "02-folder/file",
            ],
            "title": "Folder",
          },
    -     "03-file",
          Object {
            "children": Array [
              "no-name/last",
            ],
            "title": "No Name",

      30 | 
      31 |   it("sort file and folder by prefix", async () => {
    > 32 |     expect(configOf("sort")).toEqual(expected("sort"));
         |                              ^
      33 |   });
      34 | });
      35 | 

      at Object.<anonymous> (lib/index.test.js:32:30)

My bad :sweat: I'm on it!

[nweldev]

done in #16