FIX ignore nan values when summing posteriors #1382

Job	Run time
Source distribution	1m 57s
Build wheels on Arm M1 with Python cp39	1m 58s
Build wheels on manylinux - x86_64 with Python cp39	2m 0s
Build wheels on Arm M1 with Python cp310	1m 55s
Build wheels on manylinux - x86_64 with Python cp310	2m 0s
Build wheels on Arm M1 with Python cp311	2m 2s
Build wheels on manylinux - x86_64 with Python cp311	2m 1s
Build wheels on Arm M1 with Python cp312	1m 54s
Build wheels on manylinux - x86_64 with Python cp312	2m 4s
Build wheels on macosx - x86_64 with Python cp39	3m 47s
Build wheels on macosx - x86_64 with Python cp310	3m 36s
Build wheels on macosx - x86_64 with Python cp311	2m 37s
Build wheels on macosx - x86_64 with Python cp312	4m 45s
Build wheels on win - AMD64 with Python cp39	7m 9s
Build wheels on win - AMD64 with Python cp310	6m 34s
Build wheels on win - AMD64 with Python cp311	6m 57s
Build wheels on win - AMD64 with Python cp312	6m 26s
Merge all wheels into one directory	13s
	59m 55s

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