fix: 졸학계 catalog에 해당과목 없어도 계산 할 수 있게 변경 #399

All 338 tests pass, 1 skipped in 1m 39s

339 tests ±0 338 ✔️ ±0 1m 39s ⏱️ -12s
  45 suites ±0     1 💤 ±0
  45 files ±0     0 ❌ ±0

Results for commit c5f68a5. ± Comparison against earlier commit 974049a.