Fix ensure blocks array not null before component update #1204

Job	Run time
CI / Generate matrix	21s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 54s
CI / 8.2 mariadb phpunit all	2m 46s
CI / 8.3 mysql80 phpunit all	3m 1s
CI / 8.3 mysql84 phpunit all	3m 35s
CI / 8.1 mysql57 phplinting	2m 31s
CI / 8.1 mysql57 endtoend root job1	8m 19s
CI / 8.3 mysql80 endtoend root job1	9m 40s
CI / 8.1 mysql57 endtoend root job2	7m 46s
CI / 8.3 mysql80 endtoend root job2	9m 8s
CI / 8.1 mysql57 endtoend root job3	9m 10s
CI / 8.3 mysql80 endtoend root job3	10m 39s
CI / 8.1 mysql57 endtoend root job4	9m 0s
CI / 8.3 mysql80 endtoend root job4	11m 5s
CI / 8.1 mysql57 endtoend root job5	6m 18s
CI / 8.3 mysql80 endtoend root job5	7m 27s
CI / 8.1 mysql57 endtoend root job6	8m 41s
CI / 8.3 mysql80 endtoend root job6	10m 34s
CI / 8.1 mysql57 endtoend root job7	10m 48s
CI / 8.3 mysql80 endtoend root job7	12m 17s
CI / 8.1 mysql57 js	4m 45s
CI / 8.1 mysql57 doclinting	2m 49s
CI / Dispatch tag patch release	0s
	2h 33m 35s

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