NullReferenceException when copying text from Generic XML editor

[jng]

If you try to copy selected text from the Generic XML editor, it will NRE with the following stack trace:

System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.TextEditor.Util.RtfWriter.BuildFontTable(IDocument doc, StringBuilder rtf) in d:\Workspace\maestro-trunk\Thirdparty\SharpDevelop\ICSharpCode.TextEditor\Src\Util\RtfWriter.cs:line 55
   at ICSharpCode.TextEditor.Util.RtfWriter.GenerateRtf(TextArea textArea) in d:\Workspace\maestro-trunk\Thirdparty\SharpDevelop\ICSharpCode.TextEditor\Src\Util\RtfWriter.cs:line 33
   at ICSharpCode.TextEditor.TextAreaClipboardHandler.CopyTextToClipboard(String stringToCopy, Boolean asLine) in d:\Workspace\maestro-trunk\Thirdparty\SharpDevelop\ICSharpCode.TextEditor\Src\Gui\TextAreaClipboardHandler.cs:line 103
   at ICSharpCode.TextEditor.TextAreaClipboardHandler.CopyTextToClipboard(String stringToCopy) in d:\Workspace\maestro-trunk\Thirdparty\SharpDevelop\ICSharpCode.TextEditor\Src\Gui\TextAreaClipboardHandler.cs:line 142
   at ICSharpCode.TextEditor.TextAreaClipboardHandler.Copy(Object sender, EventArgs e) in d:\Workspace\maestro-trunk\Thirdparty\SharpDevelop\ICSharpCode.TextEditor\Src\Gui\TextAreaClipboardHandler.cs:line 178
   at Maestro.Editors.Generic.XmlEditorCtrl.copyToolStripMenuItem_Click(Object sender, EventArgs e) in d:\Workspace\maestro-trunk\Maestro.Editors\Generic\XmlEditorCtrl.cs:line 401
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

The copy operation will succeed, but having this NRE thrown is obviously undesirable.

[jng]

The NRE is happening when copying XML of an active composite symbolization

[jng]

Fixed r8560