[chronojump] Two safety checks on cjCombo to avoid read from null combos

[Xavier de Blas <xaviblas src gnome org>]

commit 451610629dc0b6c079e9c24d73833584704e1635
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Feb 28 17:37:55 2022 +0100

    Two safety checks on cjCombo to avoid read from null combos

 src/gui/cjCombo.cs | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/gui/cjCombo.cs b/src/gui/cjCombo.cs
index ce2b1e456..9ea4efb67 100644
--- a/src/gui/cjCombo.cs
+++ b/src/gui/cjCombo.cs
@@ -27,6 +27,8 @@ public partial class ChronoJumpWindow
        int getExerciseIDFromName (string [] comboArrayString, string name, bool comboWithTranslation)
        {
                LogB.Information("getExerciseIDFromName for: " + name);
+               if(comboArrayString == null)
+                       return -1;
 
                string idFound = "";
 
@@ -50,6 +52,9 @@ public partial class ChronoJumpWindow
 
        int getExerciseIDFromAnyCombo(Gtk.ComboBox combo, string [] comboArrayString, bool 
comboWithTranslation)
        {
+               if(combo == null)
+                       return -1;
+
                return getExerciseIDFromName(comboArrayString, UtilGtk.ComboGetActive(combo), 
comboWithTranslation);
        }
 }