Fix Python wrapper returns SwigPyObject instead of CPACSWalls (Issue #1012) #413

Job	Run time
continuous-integration / build-macos	10m 21s
continuous-integration / build-linux (Debug, ubuntu-latest)	3m 58s
continuous-integration / build-windows (Release, windows-2019)	19m 5s
continuous-integration / build-linux (Debug, ubuntu-22.04)	3m 44s
continuous-integration / build-windows (Release, windows-latest)	18m 0s
continuous-integration / build-linux (Release, ubuntu-latest)	3m 45s
continuous-integration / build-linux (Release, ubuntu-22.04)	2m 48s
continuous-integration / test-linux (Debug, ubuntu-22.04, true)	3m 42s
continuous-integration / test-linux (Release, ubuntu-latest, true)	2m 37s
continuous-integration / test-linux (Release, ubuntu-22.04, true)	2m 27s
continuous-integration / test-linux (Debug, ubuntu-latest, false, ON)	6m 56s
continuous-integration / test-macos	4m 50s
continuous-integration / test-windows (Release, windows-2019)	1m 58s
continuous-integration / test-windows (Release, windows-latest)	1m 54s
continuous-integration / draft-release	0s
	1h 26m 5s

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