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fs: Fix normalize_path("") incongruity with Boost.filesystem
The non-BFS version of normalize_path() returns an empty string when passed an empty string, but the BFS version returns the normalized version of the current working dir for the Wesnoth process. Due to the way editor::start()'s arguments are built from the process command line, the result of normalize_path("") gets passed to it when starting with the --editor switch and no map path argument. If the result describes a directory, the editor brings up the filechooser dialog on that path; otherwise, it attempts to open it as a map file. Making the BFS version of normalize_path() follow the non-BFS behavior fixes the editor unexpectedly bringing up the filechooser when started from the command line.
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