How do I restore a bot using Azure Bot Service (Botframework)?

While working with my bot through the Microsoft Azure "Bot Sevice" template, I clicked "save" on the index.js change and got the "Failed to save" error, but then the whole file was empty and I lost all the code for my bot - who was already alive! It is deployed via Bot Framework to places like Slack, Kik, Facebook and more ...

Is there a way to recover this file? The only version I copied on my local machine is too old to use.

Thank!