class_docstr: Basic exception class for `lazycluster` library errors.
code: def __str__(self) -> str:
      if self.predecessor_excp:
          return (
              self.msg
              + " Predecessor Exception: "
              + str(self.predecessor_excp)
          )
      return self.msg
  
imports: from typing import Any, Optional
label_desc: Use image node_id 2 for calling the LazyclusterError obj's underlying member method code with example usage: obj.__str__() and returns: self, unknown