Describe the Problem

The file list parsing logic continues to fail in the Nightly Build for tc_gen. This issue is related to #1484.
The fix for that apparently did not resolve all of the issues. The NB failed for main_v9.1 on 10/4/20 and develop on 10/3/20. Both times, it failed the same way. The reference version ran fine, but the tip of the branch failed on tc_gen. It processed the input ATCF files as being file lists instead of actual ATCF files:

TEST: tc_gen_2016  - FAIL - 859.097 sec
/d3/projects/MET/MET_regression/main_v9.1/NB20201004/MET-main_v9.1/met/share/met/../../bin/tc_gen \
      -genesis /d3/projects/MET/MET_test_data/unit_test/tc_data/genesis/suite1/2016*/genesis*2016* \
      -track /d3/projects/MET/MET_test_data/unit_test/tc_data/genesis/atcf/2016 \
      -config /d3/projects/MET/MET_regression/main_v9.1/NB20201004/MET-main_v9.1/test/config/TCGenConfig_2016 \
      -out /d3/projects/MET/MET_regression/main_v9.1/NB20201004/MET-main_v9.1/test_output/tc_gen/tc_gen_2016 \
      -log /d3/projects/MET/MET_regression/main_v9.1/NB20201004/MET-main_v9.1/test_output/tc_gen/tc_gen_2016.log \
      -v 2
DEBUG 1: [Source 1 of 4327693] Genesis Source: TG,, Model Suffix: (nul)

Expected Behavior

The tc_gen tool in MET should correctly discriminate between file lists and ATCF files.

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