[chronojump] Fixed possible crash in new runInterval double contacts

[Xavier de Blas <xaviblas src gnome org>]

commit 4851b4ffefcd22bdfb15b4db161fea4a36225249
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Apr 6 20:00:02 2018 +0200

    Fixed possible crash in new runInterval double contacts

 src/execute/run.cs |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/execute/run.cs b/src/execute/run.cs
index c389893..026daa4 100644
--- a/src/execute/run.cs
+++ b/src/execute/run.cs
@@ -872,7 +872,9 @@ public class RunIntervalExecute : RunExecute
 
        protected override void updateRunPhaseInfoManage()
        {
-               runDC.UpdateList();
+               //check if it's defined at beginning of race
+               if(runDC != null)
+                       runDC.UpdateList();
        }
 
        //this will be protected and in run simple execute class