`cwltool --tool-help` fails if `doc` is a list

[sebitz]

example_tool.cwl:

cwlVersion: v1.2
class: CommandLineTool

label: A short, human-readable label.
doc:
- A longer description of the tool or workflow.
- "Ideally with examples, for instance:"
- |
      cwltool --tool-help tool_help_doclist.cwl

inputs:
  message:
    default: hello world
    type: string

outputs:
  main_output: stdout

baseCommand: echo
arguments: [ $(inputs.message) ]

stdout: message.txt

Running cwltool --tool-help example_tool.cwl (both with version 3.1.20250110105449 and 3.1.20241217163858) prints the following error:

ERROR Unhandled error, try again with --debug for more information:
  Unable to get render width for ['A longer description of the tool.', 'Ideally with examples, e.g.:', 'cwltool --tool-help tool_help_doclist.cwl\n']; a str, Segment, or object with __rich_console__ method is required

Expected output:

usage: example_tool.cwl [-h] [--message MESSAGE] [job_order]

A longer description of the tool or workflow. Ideally with examples,
for instance: cwltool --tool-help example_tool.cwl

positional arguments:
  job_order          Job input json file

options:
  -h, --help         show this help message and exit
  --message MESSAGE

Or, (maybe) even better:

usage: example_tool.cwl [-h] [--message MESSAGE] [job_order]

A short, human-readable label.

A longer description of the tool or workflow. Ideally with examples,
for instance:

  cwltool --tool-help example_tool.cwl


positional arguments:
  job_order          Job input json file

options:
  -h, --help         show this help message and exit
  --message MESSAGE