Invalid argument exception thrown during first configuration on Node 14.x

[manucuf]

Issue Description
Since Node.js 14.5 has been promoted to LTS, now it's the default version downloaded from 'stable' channel. Within this version, the method writeFileSync has a data mandatory argument. https://nodejs.org/api/fs.html#fs_fs_writefilesync_file_data_options
In initUserRepo function declared at app/util/project_init.js, this function (line 21) was called without this mandatory argument, causing ERR_INVALID_ARG_TYPE exception and application crash.

To Reproduce
Steps to reproduce the behavior:

1. Remove config/config_user.json file (to initialize the application to the first usage)
2. Start the application, compile initial configuration form and click on 'Install'
3. The exception is shown on the terminal, as the application crashes.

Expected behavior
Docker Security Playground configuration proceeds correctly and automatically redirects to http://localhost:8080/labs

Screenshots

Desktop:

• OS: Debian based Linux distro, macOS 10.15
• Browser: Chrome, Safari, Firefox
• Node.js 14.5

[Alessandro Placido Luise]

Hi manucuf,

I updated node to 14.5 to verify this issue and I confirm that your modification to the function in the pull request solves it
if (!fs.existsSync(dspID)) fs.writeFileSync(dspID, '');

thanks for your support

[gx1]

Closed with #62