Example 9: Empty Channels in file dont crash setup

[CI] Fix mamba 1.x examples #1965

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Run time

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Job	Run time
Ex9 (3.8, ubuntu-latest)	26s
Ex9 (3.11, ubuntu-latest)	21s
Ex9 (3.8, macos-latest)	20s
Ex9 (3.11, macos-latest)	24s
Ex9 (3.8, windows-latest)	1m 6s
Ex9 (3.11, windows-latest)	1m 5s
	3m 42s