Accept "nil" in char const* converter.
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drwxr-xr-x   ..
drwxr-xr-x - any_converter
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drwxr-xr-x - filesystem
drwxr-xr-x - glut
drwxr-xr-x - hello_world
drwxr-xr-x - intrusive_ptr
drwxr-xr-x - regexp