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fix wrong output in usage

Nat! authored on 30-10-2017 13:38:06
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@@ -83,7 +83,7 @@ EOF
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    local  repositories
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    repositories="`all_repository_names`"
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-   if [ -z "${repositories}" ]
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+   if [ ! -z "${repositories}" ]
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    then
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       echo "Currently available repositories are:"
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       echo "${repositories}" | sed 's/^/   /'