This a module to provide a work around for the Magento issue where checkout fails, if there is no region. The issue has been reported severally. Please find an example issue here: magento/magento2#7387
You can configure the repository and require the module in your composer.json this way:
{
"repositories": [
{
"type": "git",
"url": "https://github.com/gloong/module-quote.git"
}
],
"require": {
"gloo/module-quote": "^1.0"
}
}git clone https://github.com/gloong/module-quote.git