rimraf params validate problem

[zuishuaicc]

i use rimraf to remove specified file，but i used like this rimrafSync('') unexpectedly,then, all files under my project was deleted,i think ,is it necessary to validate the params path in rimrafSync('') ,this params can not be an empty string.it is to dangerous

[abhu85]

I've submitted a fix for this in #342.

The root cause is that path.resolve('') returns process.cwd(), so an empty string silently becomes a valid path pointing to the current directory. The fix adds validation to reject empty and whitespace-only paths before they're resolved, throwing ERR_INVALID_ARG_VALUE with a clear error message.

This is consistent with how rimraf already validates other dangerous inputs (null bytes, root directory).