ui: add the possibility to returns None as username in ui
In a later patch we want to retrieve the current username or None if it isn't
defined. Add the acceptempty parameter instead of catching Abort.
# 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