[chronojump] Compujump small fixes

[Xavier de Blas <xaviblas src gnome org>]

commit 607abe6e2ae686bf807ca3de00250e1eb6edc4fa
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Feb 22 18:03:29 2018 +0100

    Compujump small fixes

 howto_compujump_client.txt |    3 ++-
 src/gui/networks.cs        |    7 ++++---
 2 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/howto_compujump_client.txt b/howto_compujump_client.txt
index 0e75dd0..7c13c0c 100644
--- a/howto_compujump_client.txt
+++ b/howto_compujump_client.txt
@@ -25,7 +25,8 @@ $groups
 $ sqlite3 .local/share/Chronojump/chronojump.db
 delete from encoderExercise;
 
-11) delete runInterval exercises. And Add these:
+11) if the station will be runInterval:
+delete runInterval exercises. And Add these:
 
 delete from runIntervalType;
 insert into runIntervalType VALUES(1, "5 m", 5.0, 1, 1, 0, "", "");
diff --git a/src/gui/networks.cs b/src/gui/networks.cs
index 296ef01..2d0d76b 100644
--- a/src/gui/networks.cs
+++ b/src/gui/networks.cs
@@ -220,7 +220,8 @@ public partial class ChronoJumpWindow
 
        private void configInitFromPreferences()
        {
-               configChronojump = new Config();
+               if(configChronojump == null)
+                       configChronojump = new Config();
 
                configChronojump.Maximized = preferences.maximized;
                configChronojump.PersonWinHide = preferences.personWinHide;
@@ -232,7 +233,7 @@ public partial class ChronoJumpWindow
 
        private void configDo()
        {
-               LogB.Information("Config:\n" + configChronojump.ToString());
+               LogB.Information("Is Compujump?:\n" + configChronojump.Compujump.ToString());
                        
                /*
                 * TODO: do an else to any option
@@ -518,7 +519,7 @@ public partial class ChronoJumpWindow
                                if(json.LastPersonWasInserted)
                                {
                                        string imageFile = json.LastPersonByRFIDImageURL;
-                                       if(imageFile != "")
+                                       if(imageFile != null && imageFile != "")
                                        {
                                                string image_dest = Util.GetPhotoFileName(false, 
currentPerson.UniqueID);
                                                if(UtilMultimedia.GetImageType(imageFile) == 
UtilMultimedia.ImageTypes.PNG)