altosui/telegps: Display error message when attempting to graph unknown files
authorKeith Packard <keithp@keithp.com>
Tue, 18 Jun 2019 21:50:18 +0000 (14:50 -0700)
committerKeith Packard <keithp@keithp.com>
Tue, 18 Jun 2019 21:50:18 +0000 (14:50 -0700)
Instead of presenting an empty graph window.

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

No differences found