fix: update index with empty collection list #605

Job	Run time
collect-and-verify	4m 26s
lms-1(py=3.11,dj=pinned,mongo=7.0)	9m 56s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 40s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 22s
lms-4(py=3.11,dj=pinned,mongo=7.0)	22m 42s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 16s
lms-6(py=3.11,dj=pinned,mongo=7.0)	15m 43s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 1s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 43s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	9m 28s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 43s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 44s
cms-2(py=3.11,dj=pinned,mongo=7.0)	13m 20s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 35s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 45s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 30s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 32s
Unit tests successful	3s
compile-warnings-report	15s
coverage	0s
merge-artifacts	19s
	3h 4m 3s

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