[BUG] UncorEncounterModel/sample sets altitude limits to empty if model does not have an altitude layer variable

[aweinert-MIT]

Description

UncorEncounterModel.sample will set altitude minimum (min_alt_ft) and maximum (max_alt_ft) thresholds as empty if idx_L is empty. This happens when the model parameters file does not specify boundaries for the altitude layer variable

Reproducibility

Change RUN_uncor to use an unconventional model parameter file that doesn't have an altitude layer variable, such as

parameters_filename = [getenv('AEM_DIR_BAYES') filesep 'model' filesep 'blimp_v1.txt'];
% parameters_filename = [getenv('AEM_DIR_BAYES') filesep 'model' filesep 'uncor_1200exclude_rotorcraft_v1p2.txt'];

Expectation

Identify if idx_L is empty and set default values for min_alt_ft and max_alt_ft instead of setting values based on the model