Detection of the VirusTotal API Key

Hello Fabio,

This is the first of two issues. I just launched the script on my windows 10x86-64 machine accidentally without API Key and the script doesn't detect it. I agree that showing tests would be painful for the machine and that they shouldn't be displayed but I still have the files displayed one by one. Could you add it please ? And maybe just add a verbose option just in case.

Thanks !

I know that this can sound newbie-esque, but imagine if I find this script usefull, I tell an inexperienced user to install it forgetting that it needs an API Key, they would never know it. And still they would be happy because the csv file would show nothing.

Cheers !

Loris