Check how helper works on a completely empty repository

[dima74]

Potentially there will be error:

called Result::unwrap() on an Err value: GitHub { source: GitHubError { documentation_url: Some("https://docs.github.com/rest/repos/contents#get-repository-content"), errors: None, message: "Not Found" }, backtrace: Backtrace( 0: <snafu::backtrace_shim::Backtrace as snafu::GenerateImplicitData>::generate

at ./src/webhooks.rs:19:46
7: fml::webhooks::webhook_impl::{{closure}}
at ./src/webhooks.rs:65:58
6: fml::webhooks::handle_installation_event::{{closure}}
at ./src/webhooks.rs:77:72
5: fml::webhooks::on_repositories_added::{{closure}}
at ./src/github.rs:69:22
4: fml::github::get_repo_info::{{closure}}
at ./rustc/e51e98dde6a60637b6a71b8105245b629ac3fe77/library/core/src/result.rs:1073:23
3: core::result::Result<T,E>::unwrap