fix: fix #4669 by handling empty decision scores elements #5804

Job	Run time
manylinux.amd64.py3.6.build	4m 9s
manylinux.aarch64.py${{ matrix.config.version }}.build	0s
ubuntu-latest.amd64.py3.8.sdist-bundle	47s
manylinux.amd64.py3.7.build	4m 6s
manylinux.amd64.py3.8.build	4m 8s
manylinux.amd64.py3.9.build	4m 27s
macos.amd64.py3.6.build	9m 13s
windows-2019.amd64.py3.6.build	9m 45s
manylinux.amd64.py3.10.build	4m 3s
macos.amd64.py3.7.build	8m 41s
windows-2019.amd64.py3.7.build	5m 50s
macos.amd64.py3.8.build	9m 26s
windows-2019.amd64.py3.8.build	5m 54s
windows-2019.amd64.py3.9.build	2m 44s
macos.amd64.py3.9.build	9m 0s
windows-2019.amd64.py3.10.build	2m 54s
macos.amd64.py3.10.build	9m 25s
manylinux.aarch64.py${{ matrix.config.version }}.test	0s
ubuntu-latest.amd64.py3.8.sdist-build-test	4m 56s
manylinux.amd64.py3.6.test	3m 34s
manylinux.amd64.py3.7.test	3m 27s
manylinux.amd64.py3.8.test	2m 56s
manylinux.amd64.py3.9.test	2m 39s
manylinux.amd64.py3.10.test	2m 33s
macos.amd64.py3.6.test	5h 1m 58s
macos.amd64.py3.7.test	5m 9s
macos.amd64.py3.8.test	12m 18s
macos.amd64.py3.9.test	11m 43s
macos.amd64.py3.10.test	15m 45s
${{ matrix.os }}.amd64.py${{ matrix.version }}.test	0s
	7h 41m 30s

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