fix: update index with empty collection list #604

Job	Run time
collect-and-verify	5m 32s
lms-1(py=3.11,dj=pinned,mongo=7.0)	11m 25s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 37s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 28s
lms-4(py=3.11,dj=pinned,mongo=7.0)	21m 45s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 48s
lms-6(py=3.11,dj=pinned,mongo=7.0)	15m 50s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 26s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 50s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	9m 24s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 55s
cms-1(py=3.11,dj=pinned,mongo=7.0)	6m 1s
cms-2(py=3.11,dj=pinned,mongo=7.0)	12m 8s
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 40s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 46s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 36s
compile-warnings-report	9s
Unit tests successful	2s
coverage	0s
merge-artifacts	8s
	3h 9m 5s

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