implemented herehttps://github.com/galaxyproject/galaxy/pull/12528

Co-authored-by: Marius van den Beek <m.vandenbeek@gmail.com>

Fix the following test failure:

```
___________________ LintTestCase.test_lint_dependencies_okay ___________________

self = <tests.test_lint.LintTestCase testMethod=test_lint_dependencies_okay>

    @skip_if_environ("PLANEMO_SKIP_SLOW_TESTS")
    def test_lint_dependencies_okay(self):
        seqtk_seq_v6 = os.path.join(PROJECT_TEMPLATES_DIR, "seqtk_complete", "seqtk_seq.xml")
        lint_cmd = ["lint", seqtk_seq_v6]
>       self._check_exit_code(lint_cmd)

tests/test_lint.py:105:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_utils.py:110: in _check_exit_code
    return check_exit_code(self._runner, command_list, exit_code=exit_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

runner = <click.testing.CliRunner object at 0x7f362c80ca10>
command_list = ['lint', '/home/runner/work/planemo/planemo/tests/../project_templates/seqtk_complete/seqtk_seq.xml']
exit_code = 0

    def check_exit_code(runner, command_list, exit_code=0):
        expected_exit_code = exit_code
        planemo_cli = cli.planemo
        if run_verbosely():
            print(f"Invoking command [{command_list}]")
        result = runner.invoke(planemo_cli, command_list)
        if run_verbosely():
            print(f"Command list output is [{result.output}]")
        result_exit_code = result.exit_code
        if expected_exit_code is NON_ZERO_EXIT_CODE:
            matches_expectation = result_exit_code != 0
        else:
            matches_expectation = result_exit_code == expected_exit_code
        if not matches_expectation:
            message = (
                f"Planemo command [{' '.join(command_list)}] resulted in unexpected exit code [{result_exit_code}], "
                f"expected exit code [{expected_exit_code}]]. Command output [{result.output}]"
            )
            if result.exception:
                message += f" Exception [{unicodify(result.exception)}], "
                exc_type, exc_value, exc_traceback = result.exc_info
                tb = traceback.format_exception(exc_type, exc_value, exc_traceback)
                message += f"Traceback [{tb}]"
            if run_verbosely():
                print(f"Raising assertion error for unexpected exit code [{message}]")
>           raise AssertionError(message)
E           AssertionError: Planemo command [lint /home/runner/work/planemo/planemo/tests/../project_templates/seqtk_complete/seqtk_seq.xml] resulted in unexpected exit code [1], expected exit code [0]]. Command output [Linting tool /home/runner/work/planemo/planemo/project_templates/seqtk_complete/seqtk_seq.xml
E           Applying linter tests... CHECK
E           .. CHECK: 1 test(s) found.
E           Applying linter output... CHECK
E           .. INFO: 1 outputs found.
E           Applying linter inputs... WARNING
E           .. WARNING: Conditional [sample] first param of type="boolean" is discouraged, use a select
E           .. INFO: Found 9 input parameters.
E           Applying linter help... CHECK
E           .. CHECK: Tool contains help section.
E           .. CHECK: Help contains valid reStructuredText.
E           Applying linter general... CHECK
E           .. CHECK: Tool defines a version [0.1.0].
E           .. CHECK: Tool defines a name [Convert to FASTA (seqtk)].
E           .. CHECK: Tool defines an id [seqtk_seq].
E           .. CHECK: Tool targets 16.01 Galaxy profile.
E           Applying linter command... CHECK
E           .. INFO: Tool contains a command.
E           Applying linter citations... CHECK
E           .. CHECK: Found 1 likely valid citations.
E           Applying linter tool_xsd... CHECK
E           .. INFO: File validates against XML schema.
E           Failed linting
E           ] Exception [1], Traceback [['Traceback (most recent call last):\n', '  File "/home/runner/work/planemo/planemo/planemo/cli.py", line 96, in handle_blended_options\n    return f(*args, **kwds)\n', '  File "/home/runner/work/planemo/planemo/planemo/commands/cmd_lint.py", line 65, in cli\n    ctx.exit(exit_code)\n', '  File "/home/runner/work/planemo/planemo/planemo/cli.py", line 40, in exit\n    raise ExitCodeException(exit_code)\n', 'planemo.exit_codes.ExitCodeException: 1\n', '\nDuring handling of the above exception, another exception occurred:\n\n', 'Traceback (most recent call last):\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/testing.py", line 408, in invoke\n    return_value = cli.main(args=args or (), prog_name=prog_name, **extra)\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/core.py", line 1055, in main\n    rv = self.invoke(ctx)\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/core.py", line 1657, in invoke\n    return _process_result(sub_ctx.command.invoke(sub_ctx))\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/core.py", line 1404, in invoke\n    return ctx.invoke(self.callback, **ctx.params)\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/core.py", line 760, in invoke\n    return __callback(*args, **kwargs)\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/decorators.py", line 84, in new_func\n    return ctx.invoke(f, obj, *args, **kwargs)\n', '  File "/home/runner/work/planemo/planemo/.tox/py37-unit-nonredundant-noclientbuild-noshed/lib/python3.7/site-packages/click/core.py", line 760, in invoke\n    return __callback(*args, **kwargs)\n', '  File "/home/runner/work/planemo/planemo/planemo/cli.py", line 98, in handle_blended_options\n    sys.exit(e.exit_code)\n', 'SystemExit: 1\n']]

tests/test_utils.py:318: AssertionError
```