fix: fix #4669 by handling empty decision scores elements #5915

Job	Run time
manylinux.amd64.py3.6.build	4m 15s
manylinux.aarch64.py${{ matrix.config.version }}.build	0s
manylinux.amd64.py3.7.build	4m 15s
manylinux.amd64.py3.8.build	4m 5s
manylinux.amd64.py3.9.build	4m 35s
ubuntu-latest.amd64.py3.8.sdist-bundle	1m 0s
manylinux.amd64.py3.10.build	4m 20s
macos.amd64.py3.6.build	9m 35s
windows-2019.amd64.py3.6.build	13m 42s
macos.amd64.py3.7.build	9m 45s
windows-2019.amd64.py3.7.build	16m 47s
macos.amd64.py3.8.build	10m 33s
windows-2019.amd64.py3.8.build	16m 52s
macos.amd64.py3.9.build	9m 41s
windows-2019.amd64.py3.9.build	17m 46s
macos.amd64.py3.10.build	9m 36s
windows-2019.amd64.py3.10.build	18m 14s
manylinux.aarch64.py${{ matrix.config.version }}.test	0s
ubuntu-latest.amd64.py3.8.sdist-build-test	5m 11s
manylinux.amd64.py3.6.test	4m 16s
manylinux.amd64.py3.7.test	4m 3s
manylinux.amd64.py3.8.test	2m 41s
manylinux.amd64.py3.9.test	2m 30s
manylinux.amd64.py3.10.test	2m 24s
macos.amd64.py3.6.test	6m 0s
macos.amd64.py3.7.test	8m 17s
macos.amd64.py3.8.test	12m 2s
macos.amd64.py3.9.test	13m 13s
macos.amd64.py3.10.test	14m 1s
windows-2019.amd64.py3.6.test	7m 26s
windows-2019.amd64.py3.7.test	6m 42s
windows-2019.amd64.py3.8.test	6m 51s
windows-2019.amd64.py3.9.test	6m 35s
windows-2019.amd64.py3.10.test	6m 58s
	4h 24m 11s

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