[chronojump] Fixed problem on inertia moment calculation without chronopic connected

[Xavier de Blas <xaviblas src gnome org>]

commit 93e20aa091ced582564004e00004296465178d3a
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Aug 1 17:15:01 2014 +0200

    Fixed problem on inertia moment calculation without chronopic connected

 src/gui/encoder.cs |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index de950d2..28a30d9 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -350,7 +350,10 @@ public partial class ChronoJumpWindow
        }
 
        private bool encoderCheckPort() {
-               if(chronopicWin.GetEncoderPort() == Util.GetDefaultPort()) {
+               if(
+                               chronopicWin.GetEncoderPort() == "" ||
+                               chronopicWin.GetEncoderPort() == Util.GetDefaultPort()) 
+               {
                        new DialogMessage(Constants.MessageTypes.WARNING, 
                                        Catalog.GetString("Chronopic port is not configured."));
                        /*