Fixed SD2-1257. Fixed a null reference exception in the AddComponentsDialog that could occur when listing the components from a file which is not a .NET assembly.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.1@2255 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Gui/AddComponentsDialog.cs

@@ -68,7 +68,11 @@ namespace ICSharpCode.FormsDesigner.Gui
 		{
 			if (componentListView.Items.Count == 0) {
 				if (componentListView.Controls.Count == 0) {
-					ClearComponentsList(StringParser.Parse("${res:ICSharpCode.SharpDevelop.FormDesigner.Gui.AddSidebarComponents.NoComponentsFound}", new string[,] {{"Name", lastAssembly.FullName}}));
+					string name = String.Empty;
+					if (lastAssembly != null) {
+						name = lastAssembly.FullName;
+					}
+					ClearComponentsList(StringParser.Parse("${res:ICSharpCode.SharpDevelop.FormDesigner.Gui.AddSidebarComponents.NoComponentsFound}", new string[,] {{"Name", name}}));
 				}
 			}
 			componentListView.EndUpdate();