False positive on a contant value when using GeneratedCodeAttribute

[GerbrandStap]

Analyzing the following code:

[System.CodeDom.Compiler.GeneratedCodeAttribute("","")]
public class GeneratedClass
{
}

public class Test
{
	private GeneratedClass _cachedItem;

	public GeneratedClass Item
	{
		get
		{
			if( this._cachedItem == null )
			{
				this._cachedItem = new GeneratedClass();
			}
			return this._cachedItem;
		}
	}
}

Produces the error:

CodeContracts: warning: The Boolean condition this._cachedItem == null always evaluates to a constant value. If it (or its negation) appear in the source code, you may have some dead code or redundant check

When the GeneratedCodeAttribute attribute is removed, the error no longer occurs. The attribute gets added by the xsd tool in our case, so it is generated code and we'd rather not have to remove the attribute,

We use Code Contracts 1.10.20606.1.