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

[Cyndy Ishida via cfe-commits]

cyndyishida 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?

Oh yeah, that part is sufficiently exercised in the unit test.

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