fix: handle responses without policies

[apeabody]

Fixes hashicorp/terraform-provider-google#21740

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accesscontextmanager: fix panic on empty accessPolicies in `google_access_context_manager_access_policy`

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 6 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 1 file changed, 6 insertions(+), 1 deletion(-))

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run. Googlers: see go/terraform-auto-test-runs to set up automatic test runs.

@NickElliot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

Tests analytics

Total tests: 3
Passed tests: 2
Skipped tests: 0
Affected tests: 1

Click here to see the affected service packages

• accesscontextmanager

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccAccessContextManager

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccAccessContextManager [Debug log]

🔴 Tests failed when rerunning REPLAYING mode:
TestAccAccessContextManager [Error message] [Debug log]

Tests failed due to non-determinism or randomness when the VCR replayed the response after the HTTP request was made.

Please fix these to complete your PR. If you believe these test failures to be incorrect or unrelated to your change, or if you have any questions, please raise the concern with your reviewer.

---

🟢 All tests passed!

View the build log or the debug log for each test

[NickElliot]

LGTM

rechecking

[NickElliot]

/gcbrun

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 6 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 1 file changed, 6 insertions(+), 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 3
Passed tests: 3
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• accesscontextmanager

🟢 All tests passed!

View the build log

[NickElliot]

ok this time all is good!