[clang] [clang-scan-deps] Ignore import/include directives with missing filenames (PR #99520)

[Argyrios Kyrtzidis via cfe-commits]

akyrtzi wrote:

> I switched to the unit test, though I didn't figure out how to capture the same sort of round-trip testing as with the lit test.

Are you not seeing the same "infinite calls append the same token into CurDirTokens" issue via the unit test?

https://github.com/llvm/llvm-project/pull/99520