[chronojump] Webcam preferences fix for systems with no camera

[Xavier de Blas <xaviblas src gnome org>]

commit cf612580394e05bd218d51a3d5c2f6a6dbe879d1
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Apr 29 15:17:05 2019 +0200

    Webcam preferences fix for systems with no camera

 src/gui/preferences.cs | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/gui/preferences.cs b/src/gui/preferences.cs
index 489e7f4a..092b3f54 100644
--- a/src/gui/preferences.cs
+++ b/src/gui/preferences.cs
@@ -600,6 +600,13 @@ public class PreferencesWindow
 
                combo_camera = ComboBox.NewText ();
 
+               /*
+                * declare both because there is a return just here and if they are undeclred the method:
+                * on_button_accept_clicked () will fail
+                */
+               combo_camera_resolution = ComboBox.NewText ();
+               combo_camera_framerate = ComboBox.NewText ();
+
                if(wd_list.Count() == 0) {
                        //devices = Util.StringToStringArray(Constants.CameraNotFound);
                        label_no_cameras.Text = wd_list.Error;