Why is the CSS for my theme not loading while the JS is?
try wrapping the google fonts entry in quotes like this:

'//fonts.googleapis.com/css?
family=Open+Sans:400,300,600&amp;subset;=latin,cyrillic': { type: external }


Maybe there is a problem with the url using yaml special characters https://stackoverflow.com/questions/19109912/do-i-need-quotes-for-strings-in-yaml#22235064