lib: fix issue `throw null` and `throw undefined` and also `throw false` crash in repl

The issue was that when it tries to check if err.message == 'Script execution interrupted.' line 269 repl.js it throws error as e would be null or undefined. Now before it checks the err.message it checks if err was null|undefined and id so returns err before checking and exits,

# sample output repl
> throw null
Thrown: null 
> throw undefined 
Thrown: undefined

Fixes: https://github.com/nodejs/node/issues/16545 Fixes: https://github.com/nodejs/node/issues/16607

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes For make -j4 test make error 1 Flaky test-timers-block-eventloop https://github.com/nodejs/node/issues/16310

• commit message follows commit guidelines

Affected core subsystem(s)

repl