[#832] fix the issue when private key was never used #3004

Job	Run time
ci / check if job needs to run	6s
ci / prepare test matrix	17s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_dataflows	5m 2s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_dataflows	8m 21s
ci / MOODLE_35_STABLE - mariadb - php 7.1 - tool_dataflows	7m 56s
ci / MOODLE_35_STABLE - pgsql - php 7.1 - tool_dataflows	3m 55s
ci / MOODLE_35_STABLE - mariadb - php 7.2 - tool_dataflows	7m 5s
ci / MOODLE_35_STABLE - pgsql - php 7.2 - tool_dataflows	4m 30s
ci / MOODLE_36_STABLE - mariadb - php 7.1 - tool_dataflows	7m 47s
ci / MOODLE_37_STABLE - pgsql - php 7.2 - tool_dataflows	4m 39s
ci / MOODLE_38_STABLE - mariadb - php 7.3 - tool_dataflows	9m 49s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_dataflows	6m 38s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_dataflows	4m 39s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_dataflows	6m 39s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_dataflows	6m 4s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_dataflows	4m 23s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dataflows	6m 5s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dataflows	5m 45s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dataflows	6m 42s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dataflows	5m 40s
ci / Release to the Moodle plugin directory	0s
	1h 52m 2s

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