Fix Python wrapper returns SwigPyObject instead of CPACSWalls (Issue #1012) #411

Job	Run time
continuous-integration / build-macos	6m 52s
continuous-integration / build-linux (Debug, ubuntu-latest)	3m 28s
continuous-integration / build-windows (Release, windows-2019)	21m 35s
continuous-integration / build-linux (Debug, ubuntu-22.04)	3m 25s
continuous-integration / build-windows (Release, windows-latest)	18m 5s
continuous-integration / build-linux (Release, ubuntu-latest)	2m 27s
continuous-integration / build-linux (Release, ubuntu-22.04)	2m 23s
continuous-integration / test-linux (Debug, ubuntu-22.04, true)	3m 6s
continuous-integration / test-linux (Release, ubuntu-latest, true)	2m 34s
continuous-integration / test-linux (Release, ubuntu-22.04, true)	2m 38s
continuous-integration / test-linux (Debug, ubuntu-latest, false, ON)	6m 48s
continuous-integration / test-macos	6m 4s
continuous-integration / test-windows	0s
continuous-integration / draft-release	0s
	1h 19m 25s

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