[clang-tools-extra] [clang-tidy] Fix false-positives in readability-container-size-empty (PR #74140)

[Justin Cady via cfe-commits]

https://github.com/justincady approved this pull request.

[Context](https://github.com/llvm/llvm-project/pull/77203#pullrequestreview-1818501835).

LGTM.

https://github.com/llvm/llvm-project/pull/74140