Merge pull request #7864 from ampproject/fix/isset-check #1684

Job	Run time
Pre run	4s
Lint: CSS	53s
Build: dev build ZIP	1m 32s
Feature tests: PHP 7.4, WP latest	3m 0s
E2E test: JS (1, 2)	8m 11s
Build: prod build ZIP	1m 53s
Feature tests: PHP 8.3, WP trunk	3m 5s
E2E test: JS (2, 2)	4m 46s
Feature tests: PHP 8.2, WP trunk	2m 54s
Lint: JS	58s
Lint: PHP	55s
Feature tests: PHP 8.1, WP trunk	3m 4s
Feature tests: PHP 8.0, WP latest	2m 57s
Static Analysis: PHP	54s
Feature tests: PHP 7.4, WP 6.5	2m 54s
Unit test: JS	53s
Unit test: PHP 8.0, WP latest	3m 10s
Unit test: PHP 8.3, WP trunk	3m 9s
Unit test: PHP 8.2, WP trunk	3m 15s
Unit test: PHP 8.1, WP trunk	3m 10s
Unit test: PHP 8.0, WP trunk	3m 27s
Unit test (with coverage): PHP 8.0, WP latest	4m 44s
Unit test: PHP 8.0, WP latest	2m 43s
Unit test: PHP 7.4, WP latest	3m 15s
Unit test: PHP 7.4, WP latest	2m 48s
Unit test: PHP 7.4, WP 6.5	3m 9s
Unit test: PHP 7.4, WP 6.5	2m 42s
Upload plugin ZIPs to Google Cloud Storage	26s
Comment on PR with links to plugin ZIPs	0s
	1h 14m 51s

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