[bug] MergeHandler fails when commit is not linked to user account

[sstok]

HubKit version(s) affected: 1.0

Description
This pull request failed to merge because the commit was using the GitHub web interface, and no user was selected.
rollerworks/PasswordStrengthValidator#39

Possible Solution

        foreach ($commits as $commit) {
            if (! isset($commit['author'])) {
                $authors['web-flow'] = $authors['commit']['author']['name'] ?? 'web-flow'; // web-flow is the default user for GitHub web edited commits.
            } else {
                $authors[$commit['author']['login']] = $commit['author']['login'];
            }

            $message .= $commit['sha'].' '.explode("\n", $commit['commit']['message'], 2)[0]."\n";
        }

Additional context

Print-r dump of the commit.

Array
(
    [sha] => 0a4acd92e95a6d5df7f08a955af3aee10b03f02b
    [node_id] => MDY6Q29tbWl0MzIyNTU4MDI3OjBhNGFjZDkyZTk1YTZkNWRmN2YwOGE5NTVhZjNhZWUxMGIwM2YwMmI=
    [commit] => Array
        (
            [author] => Array
                (
                    [name] => Cédric Martineau
                    [email] => c.martineau@soqrate.com
                    [date] => 2020-12-18T11:04:46Z
                )

            [committer] => Array
                (
                    [name] => Cédric Martineau
                    [email] => c.martineau@soqrate.com
                    [date] => 2020-12-18T11:04:46Z
                )

            [message] => Fix regex for specials characters
            [tree] => Array
                (
                    [sha] => 27221ca879d57cc0e6353b9f827e6f5276c4feab
                    [url] => https://api.github.com/repos/tino299/PasswordStrengthValidator/git/trees/27221ca879d57cc0e6353b9f827e6f5276c4feab
                )

            [url] => https://api.github.com/repos/tino299/PasswordStrengthValidator/git/commits/0a4acd92e95a6d5df7f08a955af3aee10b03f02b
            [comment_count] => 0
            [verification] => Array
                (
                    [verified] =>
                    [reason] => unsigned
                    [signature] =>
                    [payload] =>
                )

        )

    [url] => https://api.github.com/repos/tino299/PasswordStrengthValidator/commits/0a4acd92e95a6d5df7f08a955af3aee10b03f02b
    [html_url] => https://github.com/tino299/PasswordStrengthValidator/commit/0a4acd92e95a6d5df7f08a955af3aee10b03f02b
    [comments_url] => https://api.github.com/repos/tino299/PasswordStrengthValidator/commits/0a4acd92e95a6d5df7f08a955af3aee10b03f02b/comments
    [author] =>
    [committer] =>
    [parents] => Array
        (
            [0] => Array
                (
                    [sha] => 98a72a0a8a2f599afee137666ae0c4faceee25d3
                    [url] => https://api.github.com/repos/tino299/PasswordStrengthValidator/commits/98a72a0a8a2f599afee137666ae0c4faceee25d3
                    [html_url] => https://github.com/tino299/PasswordStrengthValidator/commit/98a72a0a8a2f599afee137666ae0c4faceee25d3
                )

        )

)

Note. I will try to fix this later today 👍🏼

[sstok]

Trouble waking-up 😬

We can simply use the pr author (not the commit author) if this information is missing 🤷🏼‍♂️
And actually better to fix this in the GitHub service directly in case this problem appears somewhere else.