fix: circuvent meilisearch bug with empty objects #624

Job	Run time
collect-and-verify	4m 23s
lms-1(py=3.11,dj=pinned,mongo=7.0)	10m 16s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 25s
lms-3(py=3.11,dj=pinned,mongo=7.0)	9m 18s
lms-4(py=3.11,dj=pinned,mongo=7.0)	9m 6s
lms-5(py=3.11,dj=pinned,mongo=7.0)	8m 39s
lms-6(py=3.11,dj=pinned,mongo=7.0)	8m 37s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 10s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 17s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 15s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 0s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 4s
cms-2(py=3.11,dj=pinned,mongo=7.0)	13m 11s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 44s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 12s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	6m 49s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 48s
Unit tests successful	4s
coverage	0s
compile-warnings-report	0s
merge-artifacts	0s
	2h 19m 18s

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