LaplacianThickness() trait error path like object

[relyativist]

Summary

LaplacianThickness() trait an error The 'output_image' trait of a LaplacianThicknessOutputSpec instance must be a pathlike object or string representing an existing file, but a value of '/input/wc2sub-1_struct-Flair_thickness.nii' <class 'str'> was specified.

Actual behavior

doesn't the output thickness file if called with from nipype.interfaces.ants import LaplacianThickness, with an error The 'output_image' trait of a LaplacianThicknessOutputSpec instance must be a pathlike object or string representing an existing file, but a value of '/input/wc2sub-1_struct-Flair_thickness.nii' <class 'str'> was specified.

Expected behavior

produces thickness file. If it called with function in shell, not in python:
LaplacianThickness wc2sub-1_struct-Flair.nii wc1sub-1_struct-Flair.nii thickness_sub-1_struct-Flair.nii,
output file successfully produced.

How to replicate the behavior

Script/Workflow details

cort_thick = LaplacianThickness()
cort_thick.inputs.input_wm = 'wc2sub-1_struct-Flair.nii'
cort_thick.inputs.input_gm = 'wc1sub-1_struct-Flair.nii'
cort_thick.inputs.output_image = 'thickness_sub-1_struct-Flair.nii'
cort_thick.run()

print(cort_thick.cmdline)
#cort_thick.inputs.output_image = 'thickness_sub-1_struct-Flair.nii'
#print(cort_thick.cmdline)

Please put URL to code or code here (if not too long).

Platform details:

{'commit_hash': '<not found>',
 'commit_source': '(none found)',
 'networkx_version': '2.6.3',
 'nibabel_version': '3.2.1',
 'nipype_version': '1.6.1',
 'numpy_version': '1.21.2',
 'pkg_path': '/src/nipype/nipype',
 'scipy_version': '1.7.1',
 'sys_executable': '/opt/miniconda-latest/envs/neuro/bin/python3.8',
 'sys_platform': 'linux',
 'sys_version': '3.8.12 | packaged by conda-forge | (default, Sep 29 2021, '
                '19:52:28) \n'
                '[GCC 9.4.0]',
 'traits_version': '6.2.0'}

Execution environment

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• Container [Tag: latest]

[effigies]

Looks like we need to change that parameter from File to Str. Would you mind submitting a PR?