Don't segfault on zero-channel MP3s. #1312

Job	Run time
Pre-build on macos-13 with clang	1m 17s
Pre-build on ubuntu-20.04 with gcc	54s
Lint C++	43s
Lint Python (3.12, ubuntu-20.04)	13s
Pre-build on ubuntu-20.04 with clang	52s
Build wheel for ${{ matrix.build }}	0s
merge	0s
Test with Python 3.8 + Address Sanitizer	21m 28s
Test with Python 3.9 + Address Sanitizer	21m 16s
Test with Python 3.10 + Address Sanitizer	25m 34s
Test with Python 3.11 + Address Sanitizer	24m 51s
Test with Python 3.12 + Address Sanitizer	19m 38s
Test 1 / 8 with Python 3.12 on ubuntu-20.04	2m 18s
Test 2 / 8 with Python 3.12 on ubuntu-20.04	3m 0s
Test 3 / 8 with Python 3.12 on ubuntu-20.04	2m 26s
Test 4 / 8 with Python 3.12 on ubuntu-20.04	2m 36s
Test 5 / 8 with Python 3.12 on ubuntu-20.04	2m 20s
Test 6 / 8 with Python 3.12 on ubuntu-20.04	2m 27s
Test 7 / 8 with Python 3.12 on ubuntu-20.04	2m 30s
Test 8 / 8 with Python 3.12 on ubuntu-20.04	2m 31s
Test with Python 3.8 on macos-13	27m 30s
Test with Python 3.9 on macos-13	23m 33s
Test with Python 3.10 on macos-13	27m 3s
Test with Python 3.11 on macos-13	29m 20s
Test with Python 3.12 on macos-13	23m 14s
Test with Python 3.13.0-rc.1 on macos-13	27m 21s
Test with Python 3.8 on ubuntu-20.04	10m 38s
Test with Python 3.9 on ubuntu-20.04	10m 56s
Test with Python 3.10 on ubuntu-20.04	14m 4s
Test with Python 3.11 on ubuntu-20.04	13m 41s
Test with Python 3.12 on ubuntu-20.04	10m 23s
Test with Python 3.13.0-rc.1 on ubuntu-20.04	11m 13s
Test with Python 3.12 on windows-latest	14m 36s
Test with Python 3.13.0-rc.1 on windows-latest	15m 3s
Upload wheels to PyPI	0s
	6h 35m 29s

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