Fix dmarc undefined array key #84 #287

Job	Run time
test / check if job needs to run	3s
test / prepare test matrix	15s
test / MOODLE_39_STABLE - mariadb - php 7.2 - tool_emailutils	3m 4s
test / MOODLE_310_STABLE - pgsql - php 7.2 - tool_emailutils	3m 2s
test / MOODLE_311_STABLE - mariadb - php 7.3 - tool_emailutils	2m 43s
test / MOODLE_39_STABLE - mariadb - php 7.3 - tool_emailutils	3m 0s
test / MOODLE_39_STABLE - pgsql - php 7.2 - tool_emailutils	2m 59s
test / MOODLE_39_STABLE - pgsql - php 7.3 - tool_emailutils	2m 52s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_emailutils	2m 50s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_emailutils	2m 46s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_emailutils	2m 54s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_emailutils	3m 21s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_emailutils	3m 11s
test / MOODLE_402_STABLE - pgsql - php 8.0 - tool_emailutils	3m 25s
test / MOODLE_402_STABLE - mariadb - php 8.0 - tool_emailutils	2m 57s
test / MOODLE_403_STABLE - pgsql - php 8.0 - tool_emailutils	2m 53s
test / MOODLE_402_STABLE - mariadb - php 8.1 - tool_emailutils	3m 25s
test / MOODLE_402_STABLE - pgsql - php 8.1 - tool_emailutils	2m 48s
test / MOODLE_403_STABLE - mariadb - php 8.0 - tool_emailutils	2m 56s
test / MOODLE_403_STABLE - mariadb - php 8.2 - tool_emailutils	3m 5s
test / MOODLE_403_STABLE - pgsql - php 8.2 - tool_emailutils	3m 50s
test / Release to the Moodle plugin directory	0s
	58m 19s

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