fix: error handling for when array_combine would fail #3021

Job	Run time
ci / check if job needs to run	7s
ci / prepare test matrix	20s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_dataflows	4m 27s
ci / MOODLE_35_STABLE - pgsql - php 7.1 - tool_dataflows	4m 7s
ci / MOODLE_35_STABLE - mariadb - php 7.2 - tool_dataflows	8m 20s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_dataflows	6m 46s
ci / MOODLE_35_STABLE - pgsql - php 7.2 - tool_dataflows	4m 41s
ci / MOODLE_35_STABLE - mariadb - php 7.1 - tool_dataflows	8m 52s
ci / MOODLE_36_STABLE - mariadb - php 7.1 - tool_dataflows	8m 42s
ci / MOODLE_37_STABLE - pgsql - php 7.2 - tool_dataflows	4m 41s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_dataflows	4m 47s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_dataflows	4m 27s
ci / MOODLE_38_STABLE - mariadb - php 7.3 - tool_dataflows	6m 20s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_dataflows	6m 13s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_dataflows	6m 44s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_dataflows	4m 49s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dataflows	4m 33s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dataflows	5m 23s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dataflows	6m 5s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dataflows	7m 8s
ci / Release to the Moodle plugin directory	0s
	1h 47m 32s

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