Need to modify post_evaluation.py to output lines in summary about failed evaluations

[coleslaw481]

If an evaluation fails and does NOT have a pickle file, post_evaluation.py will NOT output anything about that evaluation in summary.txt or the CSV files. This should be changed to report the failure of that evaluation.

To fix _get_pickle_paths should be modified to output a tuple with the second value being a list of the evaluations that are missing pickle files instead of just a count of those. Then generate_overall_csv() first needs to be adjusted to handle the adjustment to the return of _get_pickle_paths() and after the pickle file loop any evaluations without pickle files should be output as lines with NA lines for values to denote a problem.

[coleslaw481]

Updated _get_pickle_paths() to return a list of missing entries. Still not done cause generate_overall_csv() is basically just using len on missing list entries to work the same as before.