PatchUtil.java: don't sliently ignore patch chunk without prelude lines

Previously, patch content without ---/+++ prelude lines was silently ignored, which may cause patch file to be incorrectly applied. For example, https://github.com/bazelbuild/bazel/pull/16233

This PR makes sure PatchUtil correctly reports the error to users.

Closes #16239.

PiperOrigin-RevId: 472961143
Change-Id: I38d1931f7f2b8603a58de3904c3f525ab6fb3c85
2 files changed
tree: ca77fd29482abcab81a988515b384522d67dc3fe
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .gitattributes
  11. .gitignore
  12. AUTHORS
  13. BUILD
  14. CHANGELOG.md
  15. CODE_OF_CONDUCT.md
  16. CODEBASE.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. LICENSE
  26. MODULE.bazel
  27. README.md
  28. SECURITY.md
  29. WORKSPACE
  30. WORKSPACE.bzlmod
README.md

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