global_ens: Address Bugzilla 1606 - counting of models in python scripts

[malloryprow]

On 20241228, evs_mesoscale_sref_cape_past90days_plots failed with the following error.

Traceback (most recent call last):

File "/lfs/h1/ops/prod/packages/evs.v1.0.15/ush/mesoscale/ush_sref_plot_py/lead_average.py", line 1622, in
main()
File "/lfs/h1/ops/prod/packages/evs.v1.0.15/ush/mesoscale/ush_sref_plot_py/lead_average.py", line 1475, in main
plot_lead_average(
File "/lfs/h1/ops/prod/packages/evs.v1.0.15/ush/mesoscale/ush_sref_plot_py/lead_average.py", line 707, in plot_lead_average
if math.isinf(y_mod_min):
UnboundLocalError: local variable 'y_mod_min' referenced before assignment

Please double check all scripts and fix if needed in the next upgrade:

• ./ush/global_ens/time_series.py
• ./ush/global_ens/lead_average.py
• ./ush/global_ens/ush_gens_plot_py/time_series.py
• ./ush/global_ens/ush_gens_plot_py/lead_average.py

See #624 for what was delivered to fix the failed job.