make sure there a CHANGELOG.md to copy... (#5029)

.github/scripts/build-catalog.sh

@@ -76,6 +76,9 @@ patch_apps() {
     echo "categories:" >> catalog/${train}/${chartname}/item.yaml
     cat ${target}/Chart.yaml | yq '.annotations."truecharts.org/catagories"' -r >> catalog/${train}/${chartname}/item.yaml
     # Copy changelog from website
+    if [[ ! -f "website/docs/charts/${train}/${chart}/CHANGELOG.md" ]]; then
+        touch "website/docs/charts/${train}/${chart}/CHANGELOG.md"
+    fi
     cp -rf "website/docs/charts/${train}/${chart}/CHANGELOG.md" "${target}/CHANGELOG.md" 2>/dev/null || :
     sed -i '1d' "${target}/CHANGELOG.md"
     sed -i '1s/^/*for the complete changelog, please refer to the website*\n\n/' "${target}/CHANGELOG.md"
@@ -105,7 +108,6 @@ copy_apps() {
 }
 export -f copy_apps
 
-
 if [[ -d "charts/${1}" ]]; then
     echo "Start processing charts/${1} ..."
     chartversion=$(cat charts/${1}/Chart.yaml | grep "^version: " | awk -F" " '{ print $2 }')