Add dir entity to T2starmap pattern. (#898)

Also make task optional.

niworkflows/data/nipreps.json

@@ -167,7 +167,7 @@
     "sub-{subject}[/ses-{session}]/{datatype<func>|func}/sub-{subject}[_ses-{session}]_task-{task}[_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_echo-{echo}][_part-{part}][_space-{space}][_cohort-{cohort}][_desc-{desc}]_{suffix<components|mixing>|components}{extension<.json|.tsv|.nii|.nii.gz>|.tsv}",
     "sub-{subject}[/ses-{session}]/{datatype<func>|func}/sub-{subject}[_ses-{session}]_task-{task}[_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_echo-{echo}][_part-{part}][_space-{space}][_cohort-{cohort}][_desc-{desc}]_{suffix<decomposition>|decomposition}{extension<.json>|.json}",
     "sub-{subject}[/ses-{session}]/{datatype<func>|func}/sub-{subject}[_ses-{session}]_task-{task}[_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_echo-{echo}][_hemi-{hemi<L|R>}][_space-{space}][_cohort-{cohort}][_den-{density}][_desc-{desc}]_{suffix<bold>}{extension<.dtseries.nii|.dtseries.json|.func.gii|.func.json>}",
-    "sub-{subject}[/ses-{session}]/{datatype<func>}/sub-{subject}[_ses-{session}]_task-{task}[_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<T2starmap>}{extension<.nii|.nii.gz|.json>|.nii.gz}",
+    "sub-{subject}[/ses-{session}]/{datatype<func>}/sub-{subject}[_ses-{session}][_task-{task}][_acq-{acquisition}][_ce-{ceagent}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<T2starmap>}{extension<.nii|.nii.gz|.json>|.nii.gz}",
     "sub-{subject}[/ses-{session}]/{datatype<dwi>|dwi}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<dwi|dwiref|epiref|lowb|dseg>}{extension<.json|.nii.gz|.nii>|.nii.gz}",
     "sub-{subject}[/ses-{session}]/{datatype<dwi>|dwi}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}]_desc-{desc}_{suffix<mask>}{extension<.json|.nii.gz|.nii>|.nii.gz}",
     "sub-{subject}[/ses-{session}]/{datatype<dwi>|dwi}/sub-{subject}[_ses-{session}][_acq-{acquisition}][_rec-{reconstruction}][_dir-{direction}][_run-{run}][_space-{space}][_cohort-{cohort}][_res-{resolution}][_desc-{desc}]_{suffix<dwi>}{extension<.tsv|.bval|.bvec|.b>|.tsv}",