daemon: fix long-standing bug in status request

Gracefully handle a status request when self.network is None

lib/daemon.py

@@ -100,6 +100,7 @@ class Daemon(DaemonThread):
         if sub == 'start':
             response = "Daemon already running"
         elif sub == 'status':
+            if self.network:
                 p = self.network.get_parameters()
                 response = {
                     'path': self.network.config.path,
@@ -109,8 +110,11 @@ class Daemon(DaemonThread):
                     'nodes': self.network.get_interfaces(),
                     'connected': self.network.is_connected(),
                     'auto_connect': p[4],
-                'wallets': dict([ (k, w.is_up_to_date()) for k, w in self.wallets.items()]),
+                    'wallets': {k: w.is_up_to_date()
+                                for k, w in self.wallets.items()},
                 }
+            else:
+                response = "Daemon offline"
         elif sub == 'stop':
             self.stop()
             response = "Daemon stopped"