code: def is_empty_dataframe(df):
      """A simple function to tell whether the passed in df is an empty dataframe or not.
      Parameters
      ----------
      df : pd.DataFrame
          given input dataframe
  
      Returns
      -------
      bool : True if df is none, or if df is an empty dataframe; False otherwise.
      """
      return df is None or (isinstance(df, pd.DataFrame) and df.empty)
  
file_path: orbit/orbit/utils/general.py
imports: import os
  import numpy
  import pandas
  from copy import deepcopy
  from itertools import product
label_desc: Use image node_id 4 for calling a global function with example usage: is_empty_dataframe(df) and returns: unknown