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Correct default data type when container_arns is empty#3

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violet-hall-verna wants to merge 1 commit intowuunder:mainfrom
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Correct default data type when container_arns is empty#3
violet-hall-verna wants to merge 1 commit intowuunder:mainfrom
violet-hall-verna:main

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Calling &Map.get/2 on an empty list throws an error. Instead we can return an empty map and provide a default to &Map.get/3 to correctly do nothing instead erroring.

Signed-off-by: Violet Hall <violet.hall@verna.earth>
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