gegps: don't crash on missing Altitude in TPV

Some GPS, like ublox8 in fixed position (time) mode, do not output
alt in TPV.  No idea why you would run gegps in fixed position
mode...

1 files changed, 7 insertions, 1 deletions

diff --git a/gegps b/gegps
index 861ca1af..1b3ee401 100755
--- a/gegps
+++ b/gegps
@@ -53,7 +53,13 @@ def kmlize(tpv):
     speed_in = tpv['speed']               # meter/second
     speed = speed_in * gps.MPS_TO_KPH     # Km/h
     heading = int(round(tpv['track'], 0))
-    altitude = tpv['alt']
+
+    # not all TPV includes altitude
+    # like ublox8 in fixed position (time) mode
+    if 'alt' in tpv:
+        altitude = tpv['alt']
+    else:
+        altitude = 0
 
     if speed < 1:
         heading = 0