only run migration if conf exists

redirect stderr to /dev/null

Signed-off-by: Eric Nemchik <[email protected]>

Author: nemchik

Diff for: root/migrations/02-default-location

@@ -5,7 +5,7 @@ DEFAULT_CONF="/config/nginx/site-confs/default.conf"
 OLD_ROOT="root /var/www/html/public;"
 NEW_ROOT="root /app/www/public;"
 
-if grep -q "${OLD_ROOT}" "${DEFAULT_CONF}"; then
+if [[ -f "${DEFAULT_CONF}" ]] && grep -q "${OLD_ROOT}" "${DEFAULT_CONF}" 2>/dev/null; then
     echo "updating root in ${DEFAULT_CONF}"
     sed -i "s|${OLD_ROOT}|${NEW_ROOT}|" "${DEFAULT_CONF}"
 fi