fix(scripts): exit when change log file is empty

.gitea/scripts/add-annotations.sh

@@ -97,7 +97,11 @@ while IFS= read -r line; do
   fi
 done <<< "${COMMIT_TITLES}"
 
-yq --no-colors --inplace ".annotations.\"artifacthub.io/changes\" |= loadstr(\"${YAML_FILE}\") | sort_keys(.)" "${CHART_FILE}"
-yq --no-colors --inplace ".version = \"${NEW_TAG}\"" "${CHART_FILE}"
+if [ -s "${YAML_FILE}" ]; then
+  yq --no-colors --inplace ".annotations.\"artifacthub.io/changes\" |= loadstr(\"${YAML_FILE}\") | sort_keys(.)" "${CHART_FILE}"
+else
+  echo "ERROR: Changelog file is empty: ${YAML_FILE}"
+  exit 1
+fi
 
 rm "${YAML_FILE}"