code: def remove_invalid_models_from_list(modellist):
      # remove invalid models (no trend but damped)
      for i, model in enumerate(modellist):
          if model[1] is None and model[3]:
              del modellist[i]
  
imports: from statsmodels.compat.pandas import QUARTER_END
  from statsmodels.compat.platform import PLATFORM_LINUX32, PLATFORM_WIN
  from itertools import product
  import json
  import pathlib
  import numpy
  from numpy.testing import assert_allclose, assert_almost_equal
  import pandas
  import pytest
  import scipy.stats
  from statsmodels.tsa.exponential_smoothing.ets import ETSModel
  import statsmodels.tsa.holtwinters
  import statsmodels.tsa.statespace.exponential_smoothing
label_desc: Use image node_id 1 for calling a global function with example usage: remove_invalid_models_from_list(modellist) without return types