altosui: Add a 'Graph Flight' button to the 'landed' tab

This lets you see the results of a flight as soon as the rocket lands
using the telemetry data.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/altosui/AltosFlightReader.java b/altosui/AltosFlightReader.java
index 3a171444..47df375d 100644
--- a/altosui/AltosFlightReader.java
+++ b/altosui/AltosFlightReader.java
@@ -42,4 +42,6 @@ public class AltosFlightReader {
 	void save_telemetry() { }
 
 	void update(AltosState state) throws InterruptedException { }
+
+	File backing_file() { return null; }
 }