Fix InteriorPointPoint to handle empty elements (#977) #2354

Job	Run time
Windows (mingw-w64, Release, 11, x86_64, windows-2019)	13m 5s
Windows (mingw-w64, Debug, 11, x86_64, windows-2019)	17m 7s
CMake Subproject	2m 49s
Linux (g++, Coverage, 11, 64, g++, 3.15.*, -DBUILD_BENCHMARKS=ON, ubuntu-20.04)	7m 42s
Windows (Visual Studio 2019, Release, windows-2019)	12m 0s
Windows (Visual Studio 2022, Debug, windows-2022)	12m 6s
Linux (clang++, Release, 11, 64, clang, 3.13.*, ubuntu-20.04)	6m 21s
Linux (clang++, Debug, 11, 64, clang, 3.17.*, ubuntu-20.04)	8m 18s
Linux (clang++, Release, 14, 64, clang, 3.17.*, ubuntu-20.04)	6m 35s
Linux (g++, Release, 11, 64, g++, 3.22.*, ubuntu-22.04)	6m 59s
	1h 33m 2s

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