Internal function to check that a time series list is a list of zoo objects and has a minimum number of objects. For a more comprehensive test, use tsl_diagnose().
See also
Other internal:
utils_boxplot_common(),
utils_check_args_distantia(),
utils_check_args_matrix(),
utils_check_args_momentum(),
utils_check_args_path(),
utils_check_args_zoo(),
utils_check_distance_args(),
utils_check_list_class(),
utils_clean_names(),
utils_digits(),
utils_distantia_df_split(),
utils_prepare_df(),
utils_prepare_matrix(),
utils_prepare_matrix_list(),
utils_prepare_time(),
utils_prepare_vector_list(),
utils_prepare_zoo_list(),
utils_tsl_pairs()
