[chronojump] Run encoder trigger display blank if no triggers

[Xavier de Blas <xaviblas src gnome org>]

commit ca36a1d357791300d4700a09ee6793cdeca9375f
Author: Xavier de Blas <xaviblas gmail com>
Date:   Tue Jan 28 22:17:59 2020 +0100

    Run encoder trigger display blank if no triggers

 src/gui/trigger.cs | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/gui/trigger.cs b/src/gui/trigger.cs
index dcd801db..4627d2f5 100644
--- a/src/gui/trigger.cs
+++ b/src/gui/trigger.cs
@@ -71,6 +71,10 @@ public partial class ChronoJumpWindow
                        TextBuffer tb1 = new TextBuffer (new TextTagTable());
                        tb1.Text = triggerListRunEncoder.ToString();
                        textview_run_encoder_triggers.Buffer = tb1;
+               } else {
+                       TextBuffer tb1 = new TextBuffer (new TextTagTable());
+                       tb1.Text = "";
+                       textview_run_encoder_triggers.Buffer = tb1;
                }
        }
 }