code: def test_index_exists(precalculated_rf_classifier_explainer):
      assert precalculated_rf_classifier_explainer.index_exists(0)
      assert precalculated_rf_classifier_explainer.index_exists(
          precalculated_rf_classifier_explainer.idxs[0]
      )
      assert not precalculated_rf_classifier_explainer.index_exists(
          "bla"
      )
  
imports: import pytest
  import pandas
  import numpy
  from pandas.api.types import is_categorical_dtype, is_numeric_dtype
  import plotly.graph_objects
  from explainerdashboard import ClassifierExplainer, ExplainerDashboard
  from explainerdashboard.explainer_methods import IndexNotFoundError
label_desc: Use image node_id 8 for calling a global function with example usage: test_index_exists(precalculated_rf_classifier_explainer) without return types