Fix deviceId not generating

Change the logic around xbmcvfs.File() since it doesn't causes an error
but instead returns an empty string.

resources/lib/clientinfo.py

@@ -81,19 +81,14 @@ class ClientInfo():
         else:
             GUID_file = xbmc.translatePath(os.path.join(addon_path.encode("utf-8"), "machine_guid")).decode('utf-8')
 
-        try:
         GUID = xbmcvfs.File(GUID_file)
-        
-        except Exception as e: # machine_guid does not exists.
-            self.logMsg("Generating a new deviceid: %s" % e, 1)
+        clientId = GUID.read()
+        if not clientId:
+            self.logMsg("Generating a new deviceid...", 1)
             clientId = str("%012X" % uuid4())
             GUID = xbmcvfs.File(GUID_file, 'w')
             GUID.write(clientId)
 
-        else: # machine_guid already exists. Get guid.
-            clientId = GUID.read()
-        
-        finally:
         GUID.close()
 
         self.logMsg("DeviceId loaded: %s" % clientId, 1)