[fix] Allow yunohost firewall service to be run even if YunoHost is unconfigured

data/actionsmap/yunohost.yml

@@ -1017,6 +1017,9 @@ firewall:
         reload:
             action_help: Reload all firewall rules
             api: PUT /firewall
+            configuration:
+                authenticate: false
+                lock: false
 
         ### firewall_allow()
         allow:

src/yunohost/firewall.py

@@ -199,6 +199,10 @@ def firewall_reload():
     reloaded = False
     errors = False
 
+    # Do not continue if YunoHost is not configured
+    try: open('/etc/yunohost/installed')
+    except IOError: return True
+
     # Check if SSH port is allowed
     ssh_port = _get_ssh_port()
     if ssh_port not in firewall_list()['opened_ports']: