Fix dmarc undefined array key #84 #274

Job	Run time
test / check if job needs to run	4s
test / prepare test matrix	20s
test / MOODLE_311_STABLE - mariadb - php 7.3 - tool_emailutils	2m 34s
test / MOODLE_39_STABLE - pgsql - php 7.2 - tool_emailutils	3m 4s
test / MOODLE_39_STABLE - mariadb - php 7.2 - tool_emailutils	3m 1s
test / MOODLE_310_STABLE - pgsql - php 7.2 - tool_emailutils	2m 58s
test / MOODLE_39_STABLE - mariadb - php 7.3 - tool_emailutils	3m 7s
test / MOODLE_39_STABLE - pgsql - php 7.3 - tool_emailutils	3m 7s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_emailutils	3m 8s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_emailutils	2m 47s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_emailutils	3m 6s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_emailutils	3m 18s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_emailutils	3m 8s
test / MOODLE_402_STABLE - pgsql - php 8.0 - tool_emailutils	3m 8s
test / MOODLE_402_STABLE - mariadb - php 8.0 - tool_emailutils	2m 59s
test / MOODLE_402_STABLE - pgsql - php 8.1 - tool_emailutils	2m 53s
test / MOODLE_402_STABLE - mariadb - php 8.1 - tool_emailutils	2m 42s
test / MOODLE_403_STABLE - pgsql - php 8.0 - tool_emailutils	3m 27s
test / MOODLE_403_STABLE - mariadb - php 8.0 - tool_emailutils	2m 53s
test / MOODLE_403_STABLE - pgsql - php 8.2 - tool_emailutils	3m 4s
test / MOODLE_403_STABLE - mariadb - php 8.2 - tool_emailutils	3m 14s
test / Release to the Moodle plugin directory	0s
	58m 2s

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