bug in PopulateXsltArgumentList()

I had a problem with a controller that did not set a property. This resulted in an error 
(null pointer) in PopulateXsltArgumentList().
So I suggest to patch XsltTransform PopulateXsltArgumentList().

I think it is safer to check if item.Value == null before doing a item.Value.GetType()

protected XsltArgumentList PopulateXsltArgumentList() 
			{
.....
....
      foreach (DictionaryEntry item in this.tctx.Params) 
				{
					
					if(null == item.Value) continue;
					
					if                                                                                                                        
			((typeof(string).Equals(item.Value.GetType())) etc....
					


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