Handle crash when no gateway is available (offline machines)

glances/plugins/glances_ports.py

@@ -118,7 +118,9 @@ class Plugin(GlancesPlugin):
 
         # Build the string message
         for p in self.stats:
-            if p['status'] is None:
+            if p['host'] is None:
+                status = 'None'
+            elif p['status'] is None:
                 status = 'Scanning'
             elif isinstance(p['status'], bool_type) and p['status'] is True:
                 status = 'Open'

glances/ports_list.py

@@ -68,7 +68,10 @@ class GlancesPortsList(object):
             default_gateway = config.get_value(self._section, 'port_default_gateway', default='False')
             if default_gateway.lower().startswith('true') and netifaces_tag:
                 new_port = {}
-                new_port['host'] = netifaces.gateways()['default'][netifaces.AF_INET][0]
+                try:
+                    new_port['host'] = netifaces.gateways()['default'][netifaces.AF_INET][0]
+                except KeyError:
+                    new_port['host'] = None
                 # ICMP
                 new_port['port'] = 0
                 new_port['description'] = 'DefaultGateway'