Shopify Theme Kit Time Out

During my first time of using the Shopify Theme Kit, I ran into some problems during setup. One of the issues was that Theme Kit gave me a timeout during synch and it turned out that it doesn't like empty config settings.

Received Update event on snippets/size-filter-dynamic.liquid
[999]Could not perform Update to snippets/size-filter-dynamic.liquid at Host Unknown
    Put https://xxx.myshopify.com/admin/themes/xxx/assets.json: dial tcp 23.227.38.68:443: i/o timeout
Received Update event on snippets/size-filter-dynamic.liquid
[999]Could not perform Update to snippets/size-filter-dynamic.liquid at Host Unknown
    Put https://xxx.myshopify.com/admin/themes/xxx/assets.json: dial tcp: i/o timeout

I found a hint in Theme Kit’s Github issues and removing the empty config entries for ignore_files: and ignores: fixed the problem.