FIX ignore nan values when summing posteriors #1358

Job	Run time
Source distribution	1m 58s
Build wheels on Arm M1 with Python cp39	1m 55s
Build wheels on manylinux - x86_64 with Python cp39	2m 6s
Build wheels on Arm M1 with Python cp310	1m 51s
Build wheels on manylinux - x86_64 with Python cp310	2m 1s
Build wheels on Arm M1 with Python cp311	3m 0s
Build wheels on manylinux - x86_64 with Python cp311	2m 8s
Build wheels on Arm M1 with Python cp312	1m 51s
Build wheels on manylinux - x86_64 with Python cp312	2m 2s
Build wheels on macosx - x86_64 with Python cp39	3m 0s
Build wheels on macosx - x86_64 with Python cp310	2m 45s
Build wheels on macosx - x86_64 with Python cp311	3m 33s
Build wheels on macosx - x86_64 with Python cp312	2m 30s
Build wheels on win - AMD64 with Python cp39	5m 33s
Build wheels on win - AMD64 with Python cp310	5m 35s
Build wheels on win - AMD64 with Python cp311	5m 31s
Build wheels on win - AMD64 with Python cp312	5m 34s
Merge all wheels into one directory	1s
	52m 54s

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