Custom each behavior (track-array) should survive an undefined item in the array #9899

Job	Run time
Type Checking (current version)	56s
Basic Test	1m 23s
Linting	1m 0s
Type Checking (other supported versions) (4.9)	1m 2s
Type Checking (other supported versions) (5.0)	1m 1s
Type Checking (other supported versions) (5.1)	1m 10s
Type Checking (other supported versions) (5.2)	1m 9s
Type Checking (other supported versions) (5.3)	1m 0s
Blueprint Tests	0s
${{ matrix.name }}	0s
Node.js Tests	0s
Browserstack Tests (Safari, Edge)	0s
Smoke tests (Full Ember Apps)	0s
Browser Tests (Firefox)	0s
Publish alpha from default branch	0s
Deploy tags to npm	0s
Publish channel to s3	0s
Notify Discord	0s
	8m 41s

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