Improve usability of khal list -d absent
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If a user provides an absent calendar name to be filtered out with `khal list -d`, an error is raised and the call stack is thrown at the user (24 lines of internals with a final "KeyError: 'absent'). To improve the usability, this commit catches this situation and properly tells the user what happend and how to remedy the situation, just like `-a absent` would do.
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If a user provides an absent calendar name to be filtered out with
khal list -d, an error is raised and the call stack is thrown at the user (24 lines of internals with a final "KeyError: 'absent').To improve the usability, this improvement catches this situation and properly tells the user what happend and how to remedy the situation, just like
-a absentwould do.