code: def _placeholders(reports: List[BaseDescription]) -> None:
      """Generates placeholders in the dataset descriptions where needed"""
  
      keys = {v for r in reports for v in r.scatter}
      type_keys = {v for r in reports for v in r.table["types"]}
      for report in reports:
          # Interactions
          for k1 in keys:
              for k2 in keys:
                  if k1 not in report.scatter:
                      report.scatter[k1] = {}
                  if k2 not in report.scatter[k1]:
                      report.scatter[k1][k2] = ""
  
          # Types
          for type_key in type_keys:
              if type_key not in report.table["types"]:
                  report.table["types"][type_key] = 0
  
imports: import json
  import warnings
  from dataclasses import asdict
  from typing import Any, List, Optional, Tuple, Union
  import pandas
  from dacite import from_dict
  from ydata_profiling.config import Correlation, Settings
  from ydata_profiling.model import BaseDescription
  from ydata_profiling.model.alerts import Alert
  from ydata_profiling.profile_report import ProfileReport
label_desc: Use image node_id 6 for calling a global function with example usage: _placeholders(reports) without return types