Bug when using time chunking immediately after setup

[plaplant]

It seems like there is a bug when attempting to build a makeflow where time chunking is used immediately after the SETUP script, but this bug doesn't show up if there are intermediate steps that are not chunked. It should be fixed so that chunking works even if it immediately follows the SETUP step.

[dannyjacobs]

I found this one. Here is the error.
Traceback (most recent call last): File "/users/djacobs/mambaforge/envs/HERA2023/bin/build_makeflow_from_config.py", line 39, in <module> mt.build_makeflow_from_config(obsids, config, output) File "/users/djacobs/mambaforge/envs/HERA2023/lib/python3.10/site-packages/hera_opm/mf_tools.py", line 683, in build_makeflow_from_config build_analysis_makeflow_from_config( File "/users/djacobs/mambaforge/envs/HERA2023/lib/python3.10/site-packages/hera_opm/mf_tools.py", line 1062, in build_analysis_makeflow_from_config per_obsid_primary_obsids = _cache_dict[key] KeyError: 'SETUP_per_obsid_primary_obsids'

We initially thought that adding a null step which requires each file as input (ie no stride specified) but in testing I get the same error.