Drop try/except in `get_param_groups_dataframes`

[tsalo]

I'm currently testing out the dev branch, which combines the changes from #445 and #407, and I noticed that the cubids group output didn't include the fMRI scans. There wasn't any kind of warning that these files weren't being grouped, because we have a try/except statement get_param_groups_dataframes that just skips over entity sets that don't successfully group, without any kind of warning.

CuBIDS/cubids/cubids.py

Lines 1211 to 1219 in b172dd3

	for entity_set in entity_sets:
	try:
	(
	labeled_file_params,
	param_summary,
	modality,
	) = self.get_param_groups_from_entity_set(entity_set)
	except Exception:
	continue