Correctly returns null if an environment variables is missing 

The hard part is to test this one as we haven't even
been able to reproduce. Maybe we should just fuzz Skyframe function
for null values.

Fixes #2621.

To cherry-pick for 0.4.5 (#2472)

--
Change-Id: Ida489fb8dbd659b42a8d2bebff58d49ffeaf72c3
Reviewed-on: https://cr.bazel.build/9213
PiperOrigin-RevId: 149316508
MOS_MIGRATED_REVID=149316508
2 files changed
tree: 745cd6c846a411053315ac80dd7d682a29ccd5e7
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.sh
  13. compile.sh
  14. CONTRIBUTING.md
  15. CONTRIBUTORS
  16. ISSUE_TEMPLATE.md
  17. LICENSE
  18. LICENSE.txt
  19. README.md
  20. WORKSPACE
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Bazel (Beta)

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