Fix issue in testing libraries where there might not be a DOM node #1617

Job	Run time
Build & Test / Build & Test	1m 9s
Prepare environment	5s
Bench create10k / Bench table-app/create10k	2m 21s
Bench hydrate1k / Bench table-app/hydrate1k	1m 58s
Bench filter-list / Bench filter-list/filter-list	1m 18s
Bench many-updates / Bench many-updates/many-updates	1m 30s
Bench replace1k / Bench table-app/replace1k	2m 40s
Bench text-update / Bench text-update/text-update	48s
Bench todo / Bench todo/todo	1m 17s
Bench 03_update10th1k_x16 / Bench table-app/update10th1k	1m 0s
	14m 6s

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