views.py: prevent backtrace with unregistered client

Add check to skip unregistered clients in get_server_data_from_scopes
to prevent KeyError exception.

ogcp/views.py

@@ -608,6 +608,9 @@ def get_server_data_from_scopes(scopes, clients):
     ip_to_name = {ip: c['name'] for c in parse_scopes_from_tree(scopes, 'computer') for ip in c['ip']}
 
     for client in clients['clients']:
+        if not client['addr'] in ip_to_name:
+            continue
+
         client['name'] = ip_to_name[client['addr']]
         server_id = client['server'].id
         if server_id not in servers_data: