Add support for empty repos in GL

[filiptronicek]

Description

Makes the button injection work for empty repositories in GitLab, so that you can kickstart a project right from that page.

Related Issue(s)

Fixes CLC-1073

How to test

Visit https://gitlab.com/filiptronicek/empty

[geropl]

Can't test, but the unit tests seems ✔️

(except some that point to https://gitlab.com/svenefftinge/browser-extension-test which is no longer empty...)

[filiptronicek]

Local tests seem to be a-ok

filip@Filips-MacBook-Pro:~/Documents/GitHub/browser-extension/ > pnpm test

> [email protected] test /Users/filip/Documents/GitHub/browser-extension
> cd test && pnpm test


> [email protected] test /Users/filip/Documents/GitHub/browser-extension/test
> cp ../src/button/button-contributions.ts ./src/button-contributions-copy.ts && tsc && mocha dist/**/*.spec.js



  Platform match tests
    ✔ should detect the platform for https://gitlab.com/svenefftinge/browser-extension-test (1142ms)
    ✔ should detect the platform for https://gitlab.com/svenefftinge/browser-extension-test/-/tree/my-branch (710ms)
    ✔ should detect the platform for https://gitlab.com/filiptronicek/empty (632ms)
    ✔ should detect the platform for https://gitlab.com/svenefftinge/browser-extension-test/-/merge_requests/1 (1121ms)
    ✔ should detect the platform for https://gitlab.com/svenefftinge/browser-extension-test/-/issues/1 (1124ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test (808ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test/tree/my-branch (591ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test/commit/82d701a9ac26ea25da9b24c5b3722b7a89e43b16 (802ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test/issues/1 (613ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test/pull/2 (464ms)
    ✔ should detect the platform for https://github.com/svenefftinge/browser-extension-test/blob/my-branch/README.md (508ms)
    ✔ should detect the platform for https://bitbucket.gitpod-dev.com/users/svenefftinge/repos/browser-extension-test/browse (333ms)
    ✔ should detect the platform for https://bitbucket.gitpod-dev.com/users/svenefftinge/repos/browser-extension-test/browse?at=refs%2Fheads%2Fmy-branch (150ms)
    ✔ should detect the platform for https://bitbucket.org/efftinge/browser-extension-test/commits/ (1378ms)

  Query Selector Tests
    ✔ url (https://gitlab.com/svenefftinge/browser-extension-test) should only match 'gl-repo' (1013ms)
    ✔ url (https://gitlab.com/svenefftinge/browser-extension-test/-/tree/my-branch) should only match 'gl-repo' (657ms)
    ✔ url (https://gitlab.com/filiptronicek/empty) should only match 'gl-repo-empty' (711ms)
    ✔ url (https://gitlab.com/svenefftinge/browser-extension-test/-/merge_requests/1) should only match 'gl-merge-request' (859ms)
    ✔ url (https://gitlab.com/svenefftinge/browser-extension-test/-/issues/1) should only match 'gl-issue' (1121ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test) should only match 'gh-repo' (550ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test/tree/my-branch) should only match 'gh-repo' (142ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test/commit/82d701a9ac26ea25da9b24c5b3722b7a89e43b16) should only match 'gh-commit' (117ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test/issues/1) should only match 'gh-issues' (223ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test/pull/2) should only match 'gh-pulls' (126ms)
    ✔ url (https://github.com/svenefftinge/browser-extension-test/blob/my-branch/README.md) should only match 'gh-file' (223ms)
    ✔ url (https://bitbucket.gitpod-dev.com/users/svenefftinge/repos/browser-extension-test/browse) should only match 'bbs-repo' (298ms)
    ✔ url (https://bitbucket.gitpod-dev.com/users/svenefftinge/repos/browser-extension-test/browse?at=refs%2Fheads%2Fmy-branch) should only match 'bbs-repo' (134ms)
    ✔ url (https://bitbucket.org/efftinge/browser-extension-test/commits/) should only match 'bb-commits' (1247ms)


  28 passing (19s)