From de9ec4391249246e6a9ced5db42ba3a4f92c26cc Mon Sep 17 00:00:00 2001
From: Nils Rokita <0rokita@informatik.uni-hamburg.de>
Date: Mon, 26 Nov 2018 16:00:46 +0100
Subject: [PATCH] streamer.screen: fix undefined variable icao on emty flight
 list

The icao variable is tested for None on line 136 but is not defined if
no flight is known
---
 pyModeS/streamer/screen.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pyModeS/streamer/screen.py b/pyModeS/streamer/screen.py
index 816f915..930d9e8 100644
--- a/pyModeS/streamer/screen.py
+++ b/pyModeS/streamer/screen.py
@@ -101,6 +101,7 @@ class Screen(Thread):
         icaos = np.sort(icaos)
 
         for row in range(3, self.scr_h - 3):
+            icao = None
             idx = row + self.offset
 
             if idx > len(icaos) - 1: