OTHER: Fix crash on disconnected server.

Promoe now displays a message box, telling about what happened and
terminates correctly after that

src/mainwindow/maindisplay.cpp

@@ -39,6 +39,7 @@
 #include <QFileDialog>
 #include <QSettings>
 #include <QDebug>
+#include <QMessageBox>
 
 MainDisplay::MainDisplay (QWidget *parent) : SkinDisplay(parent)
 {
@@ -110,8 +111,21 @@ MainDisplay::MainDisplay (QWidget *parent) : SkinDisplay(parent)
 	client.volumeGet();
 
 	setupServerConfig ();
+
+	//TODO: move to better place
+	connect (&client, SIGNAL(disconnected(XClient *)), this, SLOT(handleDisconnected ()));
 }
 
+void
+MainDisplay::handleDisconnected ()
+{
+	QMessageBox::critical( this, "xmms2 daemon disconnecte",
+	                      "The xmms2 deamon has disconnected\n"
+	                      "This could be because the server crashed\n"
+	                      "or because another client has shut down the sever.",
+	                      "Quit Promoe");
+	qApp->quit ();
+}
 
 void
 MainDisplay::updateVolume (uint volume)

src/mainwindow/maindisplay.h

@@ -77,7 +77,7 @@ class MainDisplay : public SkinDisplay
 	protected slots:
 		void serverConfigChanged (QString key, QString value);
 		void setRepeatAllEnabled (bool enabled);
-
+		void handleDisconnected ();
 	protected:
 		void SetupPushButtons (void);
 		void SetupToggleButtons (void);