Bug 143901. Prevent null exceptions under certain conditions.

c_gui/CasaMain.cs

@@ -188,10 +188,17 @@ namespace Novell.CASA.GUI
 						
 			}
 			else
+			{			
+				//if (Common.IS_LINUX)
 				{
 					Glade.XML gxmlTemp = new Glade.XML(Common.GladeFile, "dialogSingleInstance", null);
 					gxmlTemp.Autoconnect(this);					
 				}
+				//else
+				//{	
+				//	Common.FocusExistingApp();
+				//}
+			}		
 		
 			Logger.DbgLog("GUI:CasaMain.CasaMain() - END");          
 		}
@@ -1390,22 +1397,30 @@ namespace Novell.CASA.GUI
 		/// 
 		internal void Focus()
 		{
+			if (windowMain != null)
 				windowMain.Present();
 		}
 
 		internal void Hide()
 		{
+			if (windowMain != null)
 				windowMain.Visible = false;
 		}
 
 		internal void Show()
+		{
+			if (windowMain == null)
+				MasterPasswordAuthentication();
+			else
 			{			
 				RefreshStores();
 				windowMain.Visible = true;
 			}
+		}
 
 		internal void Dispose()
 		{	
+			if (windowMain != null)
 				windowMain.Destroy();
 		}