Exception rendering ThreadContextStack if null value pushed into stack
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         Key: LOG4NET-35
         URL: http://issues.apache.org/jira/browse/LOG4NET-35
     Project: Log4net
        Type: Bug
  Components: Core  
    Versions: 1.2.9    
    Reporter: Nicko Cadell
 Assigned to: Nicko Cadell 
     Fix For: 1.2.10


If a null value is pushed into a ThreadContext stack then an internal log4net 
error is generated when the ThreadContextStack is rendered.
The following error and stack trace are output into the log:

<log4net.Error>Exception rendering object type 
[log4net.Util.ThreadContextStack]<stackTrace>System.NullReferenceException: 
Object reference not set to an instance of an object.
   at log4net.Util.StackFrame.get_FullMessage()
   at log4net.Util.ThreadContextStack.GetFullMessage()
   at log4net.Util.ThreadContextStack.ToString()
   at log4net.ObjectRenderer.DefaultRenderer.RenderObject(RendererMap 
rendererMap, Object obj, TextWriter writer)
   at log4net.ObjectRenderer.RendererMap.FindAndRender(Object obj, TextWriter 
writer)</stackTrace></log4net.Error>

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