Example 9: Empty Channels in file dont crash setup

[CI] Fix mamba 1.x examples #1966

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Run time

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Job	Run time
Ex9 (3.8, ubuntu-latest)	15s
Ex9 (3.11, ubuntu-latest)	17s
Ex9 (3.8, macos-latest)	23s
Ex9 (3.11, macos-latest)	20s
Ex9 (3.8, windows-latest)	1m 3s
Ex9 (3.11, windows-latest)	45s
	3m 3s