Formatter undoes any changes in script if they have not been saved

[juhanikat]

The formatter seems to simply undo any changes made to a script if those changes are not saved, making it unusable to me. Tested on 0.20.1, but I remember having this problem on an earlier version too.

To test:

1. Create a new script
2. Write any text without saving the script
3. Run the formatter (either with Format -> Format Current Script or through a shortcut)
4. The text is deleted.