fix: Handle empty course_overviews in get_courses_order_by function #32233

Job	Run time
collect-and-verify	4m 3s
lms-1(py=3.11,dj=pinned,mongo=7.0)	10m 5s
lms-2(py=3.11,dj=pinned,mongo=7.0)	13m 37s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 30s
lms-4(py=3.11,dj=pinned,mongo=7.0)	20m 37s
lms-5(py=3.11,dj=pinned,mongo=7.0)	13m 0s
lms-6(py=3.11,dj=pinned,mongo=7.0)	15m 45s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 20s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 28s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	9m 7s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 16s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 40s
cms-2(py=3.11,dj=pinned,mongo=7.0)	14m 3s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 30s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 22s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 46s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	9m 45s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 34s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 35s
Unit tests successful	3s
coverage (3.11)	1m 38s
compile-warnings-report	8s
merge-artifacts	6s
	3h 30m 58s

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