If no people were found on face book page and we abort scraping, delete the saved page file

[ErikBoesen]

This failure is caused when authentication has failed. Currently, if we change the passed token so that it's valid, and then immediately rerun the scraper, it'll use the existing page.html file from when the request failed, and the problem won't be fixed until we restart the heroku dyno (which resets the ephemeral filesystem).

Add code to the failing case to delete the page.html file.