Fixed: https://github.com/sergeche/emmet-sublime/issues/70
For SASS syntax, default dialect is sass, not scss (it’s important). According to examples from http://sass-lang.com, closing semicolon is not required.
But you can alter this behaviour: in User’s Emmet.sublime-settings file, add the sass.propertyEnd property for preferences section, like this:
{
"preferences": {
"sass.propertyEnd": ";"
}
}