Check that avahi directory exists

src/freedombone

@@ -1263,6 +1263,9 @@ function create_avahi_onion_domains {
     if [[ $SYSTEM_TYPE == "$VARIANT_MESH" ]]; then
         return
     fi
+    if [ ! -d /etc/avahi/services ]; then
+        return
+    fi
     if [ $OWNCLOUD_DOMAIN_NAME ]; then
         echo '<?xml version="1.0" standalone="no"?><!--*-nxml-*-->' > /etc/avahi/services/owncloud.service
         echo '<!DOCTYPE service-group SYSTEM "avahi-service.dtd">' >> /etc/avahi/services/owncloud.service