Fix NullReferenceException in GeneralEditorOptions.SaveOptions when closing options dialog before the font list is fully loaded.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@6271 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Options/GeneralEditorOptions.xaml.cs

@@ -41,8 +41,11 @@ namespace ICSharpCode.AvalonEdit.AddIn.Options
 		public override bool SaveOptions()
 		{
 			CodeEditorOptions options = CodeEditorOptions.Instance;
-			options.FontFamily = fontSelectionPanel.CurrentFont.Name;
-			options.FontSize = Math.Round(fontSelectionPanel.CurrentFont.Size * 96.0 / 72.0);
+			var font = fontSelectionPanel.CurrentFont;
+			if (font != null) {
+				options.FontFamily = font.Name;
+				options.FontSize = Math.Round(font.Size * 96.0 / 72.0);
+			}
 			return base.SaveOptions();
 		}
 	}