Fix edge case while getting joinable tables for tables with no links #1266

Job	Run time
Check for file changes requiring front end checks	11s
Check for file changes requiring python linter	12s
Check for file changes requiring all backend tests	12s
Check for file changes requiring python tests	12s
Check for file changes requiring SQL tests	10s
Audit front end code	0s
Run front end linter	0s
Check front end types	0s
Check front end code format	0s
Run front end tests	0s
Run SQL tests (13)	30s
Run Python tests (3.9-bookworm, 13)	11m 58s
Run SQL tests (14)	24s
Run Python tests (3.9-bookworm, 14)	12m 48s
Run SQL tests (15)	25s
Run Python linter	17s
Find unused code	7s
Run Python tests (3.9-bookworm, 15)	12m 26s
Run SQL tests (16)	22s
Run Python tests (3.9-bookworm, 16)	12m 13s
Run Python tests (3.10-bookworm, 13)	11m 47s
Run Python tests (3.10-bookworm, 14)	11m 59s
Run Python tests (3.10-bookworm, 15)	12m 39s
Run Python tests (3.10-bookworm, 16)	12m 4s
Run Python tests (3.11-bookworm, 13)	11m 42s
Run Python tests (3.11-bookworm, 14)	12m 44s
Run Python tests (3.11-bookworm, 15)	12m 38s
Run Python tests (3.11-bookworm, 16)	11m 47s
Run Python tests (3.12-bookworm, 13)	12m 30s
Run Python tests (3.12-bookworm, 14)	13m 6s
Run Python tests (3.12-bookworm, 15)	14m 34s
Run Python tests (3.12-bookworm, 16)	12m 33s
matrix_tests	1s
	3h 22m 31s

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