Smol bug fix for when UPnP device has no friendly name

tinge/__init__.py

@@ -4,7 +4,6 @@ import http
 import os
 from typing import Union
 
-import simplejson
 import toml
 from upnpy import UPnP
 
@@ -56,8 +55,10 @@ class Tinge:
             if (device.host not in self.m_discovered) and (device.host not in seen_ips):
                 seen_ips.append(device.host)
                 # Let's check if the device has the default name, if so we assume it's a hue bridge
-                if device.get_friendly_name().startswith("Philips hue"):
-                    discovered = True
+                f_name = device.get_friendly_name()
+                if f_name:
+                    if f_name.startswith("Philips hue"):
+                        discovered = True
                 # If not we try to do a request against the api and see if we get an answer we can understand
                 else:
                     discovered = is_bridge(device.host)