Fix to enter BestSampler route when temperature is 0. #2726

Job	Run time
build-and-push-docker-images	1h 51m 4s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 57s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 31s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 47s
check-python-style	9s
build-python-wheels (ubuntu-20.04, auto64)	1h 59m 52s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 55s
build-python-wheels (macos-11, auto64)	36m 31s
build-python-wheels (windows-2019, auto64)	4h 27m 11s
build-and-test-cpp-aarch64 (openblas)	4m 20s
build-python-wheels (ubuntu-20.04, aarch64)	1h 14m 11s
build-python-wheels (macos-11, arm64)	13m 41s
test-python-wheels	1s
build-and-deploy-docs	1s
publish-python-wheels-on-pypi	1s
	11h 0m 12s

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