[chronojump] On encoder cannot capture or edit exericise if no exercise exists

[Xavier de Blas <xaviblas src gnome org>]

commit 9d5dae5f3db4b05e55344408e287d5e987db4fdd
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Nov 14 16:37:00 2018 +0100

    On encoder cannot capture or edit exericise if no exercise exists

 src/gui/encoder.cs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index 73eafccc..441f5bc0 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -885,6 +885,12 @@ public partial class ChronoJumpWindow
        //called from main GUI
        void on_button_encoder_capture_clicked (object o, EventArgs args) 
        {
+               if(! selectedEncoderExerciseExists())
+               {
+                       new DialogMessage(Constants.MessageTypes.WARNING, "Need to create/select an 
exercise.");
+                       return;
+               }
+
                saveEncoderExerciseOptionsToPreferences();
 
                //if seeing "show table" move to "show graph"
@@ -4415,9 +4421,22 @@ public partial class ChronoJumpWindow
                hbox_top_person_encoder.Sensitive = ! show;
        }
 
+       //useful when there are no exercises (have been removed from database)
+       bool selectedEncoderExerciseExists ()
+       {
+               return (getExerciseIDFromCombo(exerciseCombos.CAPTURE) != -1);
+       }
+
+
        //info is now info and edit (all values can be changed), and detete (there's delete button)
        void on_button_encoder_exercise_edit_clicked (object o, EventArgs args) 
        {
+               if(! selectedEncoderExerciseExists())
+               {
+                       new DialogMessage(Constants.MessageTypes.WARNING, "Need to create/select an 
exercise.");
+                       return;
+               }
+
                EncoderExercise ex = (EncoderExercise) SqliteEncoder.SelectEncoderExercises(
                                false, getExerciseIDFromCombo(exerciseCombos.CAPTURE), false)[0];