code: def __str__(self):
      if len(self.message) > 0:
          suffix = " (%s)" % self.message
      else:
          suffix = ""
      return (
          "Cluster assignments lead to at least one empty cluster"
          + suffix
      )
  
file_path: tslearn/tslearn/clustering/utils.py
imports: from sklearn.metrics.cluster import silhouette_score
  from scipy.spatial.distance import cdist
  import numpy
  from tslearn.metrics import cdist_dtw, cdist_soft_dtw_normalized
  from tslearn.preprocessing import TimeSeriesResampler
  from tslearn.utils import to_time_series_dataset, to_time_series
label_desc: Use image node_id 2 for calling the EmptyClusterError obj's underlying member method code with example usage: obj.__str__() and returns: unknown