ENH: modify path patterns to make task optional

[adelavega]

It should not be required to specify a task in a model (i.e. run a model across all tasks)

I modified the PATH_PATTERNS to make task optional.

Need to test a bit more.

[effigies]

Gah. Failed to read all the way to the bottom. Hope your tests went well.

[adelavega]

Oops. I guess you have no objection in principle. I'll put WIP in the title next time. Tests still running.

[adelavega]

That worked for me, now testing again a use case w/ a task.

By the way, the group level files will look something like this with no task:

space-MNI152NLin2009cAsym_contrast-rms_stat-effect_statmap.nii.gz

A bit ugly but I guess that's bids compliant?

[effigies]

Yup.

[adelavega]

Okay, yup. For the record this didn't cause any problems for models w/ task for me

[effigies]

Yeah, it shouldn't have, since the only issue might be change in fallback behavior, and we're not sending multiple patterns to the same nodes.