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Supress unwated error message when the cache is empty. Closes #66.
Running fisher --list on an empty cache will display an error message because the glob $fisher_cache/* did not expand.
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function __fisher_cache_list
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find -L $fisher_cache/* -maxdepth 0 -type d | sed 's|.*/||'
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find -L $fisher_cache/* -maxdepth 0 -type d ^ /dev/null | sed 's|.*/||'
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end
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