class_docstr: Error for representing possibly multiple errors on engines
code: def _get_traceback(self, ev):
      try:
          tb = ev._ipython_traceback_text
      except AttributeError:
          return "No traceback available"
      else:
          return tb
  
imports: import builtins
  import sys
  import traceback
label_desc: Use image node_id 2 for calling the CompositeError obj's underlying member method code with example usage: obj._get_traceback(ev) and returns: tb, str