Fix conditional check in build_packages_info.yml to ensure GitHub functions are echoed only when defined

Author: OllyButters

.github/workflows/build_packages_info.yml

@@ -68,7 +68,7 @@ jobs:
               gh_functions=$(sed -n "s/^export(\(.*\))$/\1/p" NAMESPACE | tr '\n' ',')
               echo "GitHub functions: $gh_functions"
               echo $name >> ../functions.txt
-              if [ -z "${gh_functions}" ]; then
+              if [ -n "${gh_functions}" ]; then
                 echo "$gh_functions" >> ../functions.txt
               fi
             fi