[chronojump] jumpsRjFatigue, fixed divideInTwo if there are no elements

[Xavier de Blas <xaviblas src gnome org>]

commit d468f7d56441fdc4ff9cc0fb9239d632daab13a6
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Aug 17 13:00:53 2020 +0200

    jumpsRjFatigue, fixed divideInTwo if there are no elements

 src/gui/cairo/jumpsRjFatigue.cs | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/gui/cairo/jumpsRjFatigue.cs b/src/gui/cairo/jumpsRjFatigue.cs
index 9896b775..3507fd78 100644
--- a/src/gui/cairo/jumpsRjFatigue.cs
+++ b/src/gui/cairo/jumpsRjFatigue.cs
@@ -133,6 +133,9 @@ public class JumpsRjFatigueGraph : CairoXY
                        i ++;
                }
 
+               if(point_l_start.Count == 0 || point_l_end.Count == 0)
+                       return;
+
                double avgIni = sumIni / point_l_start.Count;
                double avgEnd = sumEnd / point_l_end.Count;