[longomatch] Show an error message when there are no capture devices

[Andoni Morales Alastruey <amorales src gnome org>]

commit e35125a18595217c8290ff0eba9bab1e49ffe91c
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Thu Nov 6 18:58:45 2014 +0100

    Show an error message when there are no capture devices

 LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs b/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
index 3823cec..9393039 100644
--- a/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
+++ b/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
@@ -231,7 +231,7 @@ namespace LongoMatch.Gui.Panel
                        videoDevices = devices;
 
                        foreach (Device device in devices) {
-                               string deviceElement, deviceName;
+                               string deviceName;
                                deviceName = (device.ID == "") ? Catalog.GetString ("Unknown") : device.ID;
                                devicecombobox.AppendText (deviceName);
                                devicecombobox.Active = 0;
@@ -402,6 +402,11 @@ namespace LongoMatch.Gui.Panel
                        if (sender == filebutton) {
                                projectType = ProjectType.FileProject;
                        } else if (sender == capturebutton) {
+                               if (videoDevices == null || videoDevices.Count == 0) {
+                                       Config.GUIToolkit.ErrorMessage (Catalog.GetString ("No capture 
devices found in the system"),
+                                                                       this);
+                                       return;
+                               }
                                projectType = ProjectType.CaptureProject;
                        } else if (sender == fakebutton) {
                                projectType = ProjectType.FakeCaptureProject;