Fix skin support when whole infill area is bridging #661

Job	Run time
conan-package / Calculate version numbers / Generate version numbers	21s
conan-package / Make the proper runners list	0s
conan-package / Upload latest package recipe / Upload package recipe	28s
conan-package / Upload specific package recipe / Upload package recipe	30s
conan-package / Build package	0s
npm-package / publish-npm	5m 40s
	6m 59s

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