Add check for empty  in LocalFileService::remove
Add testRemoveEmptyPath test for LocalFileService
CS Fix `if(` --> `if (`
Throw InvalidArgumentException when empty path given to LocalFileService::remove
Change exception thrown when LocalFileService::remove is passed an empty path
Merge pull request #222 from fdob/ezp-20434

Fix #EZP-20434 - LocalFileService::remove accepts empty paths, causing recursive delete of install root