Attempting to sort results in an error.

[rgelb]

Environment

• VSCode Version: 1.30.1
• OS Version: Windows 8.1 - version 6.3.9600

Actual behavior

Doing F1, then PostCSS Sorting: Run results in the following:

[Stylefmt] SyntaxError: No one parser could not parse file. See log for more details: ["JSONError: No data, empty input at 1:1\n\n^"]

Expected behavior

The .scss file has its properties sorted.

Steps to reproduce

Open a .scss file in the workspace. F1, then select PostCSS Sorting: Run