distate: add assertions to backup functions
Those assertions will prevent the backup functions from overwriting
the dirstate file in case both: suffix and prefix are empty.
(foozy suggested making that change and I agree with him)
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true