[ClangImporter][Tests] clang doesn't support the empty string as a path argument #79119
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SIL/verify_all_overlays.py is passing
-F ""
on non-Apple platforms. Swift handles that kind of, but clang doesn't support it and will get argument parsing errors. It's a pathological case, so fix SIL/verify_all_overlays.py to not do that, but also add a failsafe in ClangImporter to not pass on empty paths.rdar://142441042