code: def safe_nested_val(key_tuple, dict_obj, default_value=None):
      
      try:
          return get_nested_val(key_tuple, dict_obj)
      except (KeyError, IndexError, TypeError):
          return default_value
docs: Return a value from nested dicts by the order of the given keys tuple.
  
      Parameters
      ----------
      key_tuple : tuple
          The keys to use for extraction, in order.
      dict_obj : dict
          The outer-most dict to extract from.
      default_value : object, default None
          The value to return when no matching nested value is found.
  
      Returns
      -------
      value : object
          The extracted value, if exists. Otherwise, the given default_value.
  
      Example
      -------
      >>> dict_obj = {'a': {'b': 7}}
      >>> safe_nested_val(('a', 'b'), dict_obj)
      7
      >>> safe_nested_val(('a', 'c'), dict_obj)
  
      >>> safe_nested_val(('a', 'c'), dict_obj, 5)
      5
      >>> safe_nested_val(('d'), dict_obj, 5)
      5