Description of the problem, including code/CLI snippet

Gitlab API provide trace endpoint for job (https://docs.gitlab.com/ee/api/jobs.html). I find I run gitlab project-job trace --project-id 5623 --id 872795 and nothing return. But when I run curl -X GET -sL --header "PRIVATE-TOKEN: xxxxxx" "https://xxx.xxxx.com/api/v4/projects/5623/jobs/872795/trace", I can find the output

Expected Behavior

gitlab project-job trace should output the trace

Actual Behavior

gitlab project-job trace does not show the trace

Specifications

• python-gitlab version: 1.5.11
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): {"version":"10.6.3","revision":"753d851"}

Some investigation

I dig the code and find the root cause, gitlab.v4.cli.run method only handle four type and has no else statement.

def run(gl, what, action, args, verbose, output, fields):
    g_cli = GitlabCLI(gl, what, action, args)
    data = g_cli()

    printer = PRINTERS[output]()

    if isinstance(data, dict):
        printer.display(data, verbose=True, obj=data)
    elif isinstance(data, list):
        printer.display_list(data, fields, verbose=verbose)
    elif isinstance(data, gitlab.base.RESTObject):
        printer.display(get_dict(data, fields), verbose=verbose, obj=data)
    elif isinstance(data, six.string_types):
        print(data)

But ProjectJob.trace() return bytes (<class 'bytes'>), so there is no operation. project-job trace is a little special, it does not return a file downloadable or a json string as most of gitlab API does.

As requests.Response.content is bytes and requests.Response.text is unicode, I personal fix is replacing return utils.response_content(result, streamed, action, chunk_size) with return result.text for gitlab.v4.object.ProjectJob.trae()