stop warning when `logL==logL_birth==-inf` (#395) #88

Job	Run time
get-version	4s
pypi-release	38s
git-tag-and-release	5s
pypi-public	2m 27s
aur-release	21s
test installation from pypi	21s
Build and deploy to conda	1m 19s
test installation from conda	28s
	5m 43s

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