Photon: avoid deprecation warnings when src is null #77130

Job	Run time
Determine tests matrix	8s
Static analysis	8m 27s
Check plugin monorepo dep versions	33s
Storybook tests	2m 57s
PHP tests: PHP 7.2 WP latest	4m 44s
PHP tests: PHP 7.3 WP latest	4m 2s
PHP tests: PHP 7.4 WP latest	4m 36s
PHP tests: PHP 8.0 WP latest	4m 27s
PHP tests: PHP 8.1 WP latest	4m 39s
PHP tests: PHP 8.2 WP latest	4m 1s
PHP tests: PHP 8.3 WP latest	3m 48s
PHP tests: PHP 7.0 WP previous	5m 5s
PHP tests: PHP 8.2 WP previous	4m 34s
PHP tests: PHP 8.2 WP trunk	5m 59s
PHP tests: PHP 7.4 WP latest with WooCommerce	3m 38s
PHP tests: PHP 8.1 WP latest with wpcomsh	4m 41s
JS tests	2m 51s
	1h 9m 10s

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