Fix `IndexError` in `GitConfigParser` When a Quoted Config Value Contains a Trailing New Line by DaveLak · Pull Request #1908

Fix `IndexError` in `GitConfigParser` When a Quoted Config Value Contains a Trailing New Line by DaveLak · Pull Request #1908 · gitpython-developers/GitPython

Improve the guarding `if` check in `GitConfigParser`'s `string_decode`
function to safely handle empty strings and prevent `IndexError`s when
accessing string elements.

This resolves an IndexError in the `GitConfigParser`'s `.read()`
method when the config file contains a quoted value containing a
trailing new line.

Fixes:
gitpython-developers#1887