Accidentally adding empty item to LD_LIBRARY_PATH (or PATH, or PYTHONPATH, or ...) is a pretty common bug. This should be fixed all at once, by stopping treati

Accidentally adding empty item to LD_LIBRARY_PATH (or PATH, or PYTHONPATH, or ...) is a pretty common bug. This should be fixed all at once, by stopping treating empty string as cwd. People who actually need to have cwd in *PATH can add it explicitly.