[Editor] Exception when trying to edit the sky or lights

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Launch the editor
2. Open a level file
3. Try to edit the sky actor
4. Note the exception

What is the expected output? What do you see instead?
- No exceptions should occur

Exception text is as follows:

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Error in ComponentName SkyRenderComponent
System.NullReferenceException: Object reference not set to an instance of an 
object.

   at EditorApp.EditorForm.ActorComponentEditor.AddFileElement(XmlNode actorValues, String elementName, Int32 lineNum) in C:\bob\proj\GameCode4\Dev\Source\GCC4Editor\EditorApp\ActorComponentEditor.cs:line 237

   at EditorApp.EditorForm.ActorComponentEditor.AddComponentUI(XmlNode actorComponentValues, XmlNode editorComponentValues, Int32 lineNum) in C:\bob\proj\GameCode4\Dev\Source\GCC4Editor\EditorApp\ActorComponentEditor.cs:line 188
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OK   
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Original issue reported on code.google.com by rezinat...@gmail.com on 18 Mar 2012 at 10:08