[llvm] fix(utils/**.py): fix comparison to None (PR #94022)

[Jordan Rupprecht via llvm-commits]

rupprecht wrote:

Turns out this is one of the details in which Bazel is not exactly Python. https://buildkite.com/llvm-project/upstream-bazel/builds/99430#018fdf11-6865-4d5d-be8e-7bfab59e3cd8

More details: https://bazel.build/rules/language#differences_with_python

Reverted, but thanks for the contribution anyway!

https://github.com/llvm/llvm-project/pull/94022