Fix Python wrapper returns SwigPyObject instead of CPACSWalls (Issue #1012) #412

Job	Run time
continuous-integration / build-macos	13m 49s
continuous-integration / build-linux (Debug, ubuntu-latest)	4m 18s
continuous-integration / build-windows (Release, windows-2019)	18m 46s
continuous-integration / build-linux (Debug, ubuntu-22.04)	3m 33s
continuous-integration / build-windows (Release, windows-latest)	16m 30s
continuous-integration / build-linux (Release, ubuntu-latest)	2m 46s
continuous-integration / build-linux (Release, ubuntu-22.04)	2m 54s
continuous-integration / test-linux (Debug, ubuntu-22.04, true)	2m 53s
continuous-integration / test-linux (Release, ubuntu-latest, true)	2m 20s
continuous-integration / test-linux (Release, ubuntu-22.04, true)	2m 41s
continuous-integration / test-linux (Debug, ubuntu-latest, false, ON)	6m 32s
continuous-integration / test-macos	6m 5s
continuous-integration / test-windows	0s
continuous-integration / draft-release	0s
	1h 23m 7s

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