NaNs in QC metrics lead to opaque errors

[tsalo]

QCRSFC and high-low end up with no values after the moving average calculation, because the analysis values are all NaNs and the moving average involves dropping NaNs.

 Traceback (most recent call last):
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/experiment-2/05_ddmra.py", line 124, in <module>
    run_ddmra_analyses(project_dir, participants_file, target_file_patterns, confounds_pattern)
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/experiment-2/05_ddmra.py", line 92, in run_ddmra_analyses
    qc_thresh=0.2,
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/ddmra/ddmra/workflows.py", line 210, in run_analyses
    smoothing_curves.loc[smoothing_curve_distances, "scrubbing"] = scrub_smoothing_curve
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 719, in __setitem__
    indexer = self._get_setitem_indexer(key)
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 660, in _get_setitem_indexer
    return self._convert_tuple(key, is_setter=True)
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 785, in _convert_tuple
    idx = self._convert_to_indexer(k, axis=i, is_setter=is_setter)
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 1257, in _convert_to_indexer
    return self._get_listlike_indexer(key, axis)[1]
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 1314, in _get_listlike_indexer
    self._validate_read_indexer(keyarr, indexer, axis)
  File "/home/data/nbc/misc-projects/Salo_PowerReplication/code/conda_env/lib/python3.7/site-packages/pandas/core/indexing.py", line 1374, in _validate_read_indexer
    raise KeyError(f"None of [{key}] are in the [{axis_name}]")
KeyError: "None of [Float64Index([19.313207915827967, 19.339079605813716, 19.390719429665317,\n                19.4164878389476,  19.44222209522358, 19.467922333931785,\n              19.519221295943137, 19.544820285692065, 19.621416870348583,\n                19.6468827043885,\n              ...\n              142.89506639488994,    142.89856542317,  142.9160592795645,\n              142.93355099485913, 142.95104056983985, 142.95453822806746,\n              142.97202523570826, 142.97552238058094, 143.01048912579805,\n              143.05942821079637],\n             dtype='float64', name='distance', length=11910)] are in the [index]"