Fixed NullReferenceException when decompiling "typeof(List<int>[])".

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -751,7 +751,10 @@ namespace ICSharpCode.Decompiler.Ast
 		
 		AstType AddEmptyTypeArgumentsForUnboundGenerics(AstType type)
 		{
-			TypeDefinition typeDef = type.Annotation<TypeReference>().Resolve();
+			TypeReference typeRef = type.Annotation<TypeReference>();
+			if (typeRef == null)
+				return type;
+			TypeDefinition typeDef = typeRef.Resolve(); // need to resolve to figure out the number of type parameters
 			if (typeDef == null || !typeDef.HasGenericParameters)
 				return type;
 			SimpleType sType = type as SimpleType;

ICSharpCode.Decompiler/Tests/Generics.cs

@@ -63,6 +63,8 @@ public static class Generics
 	private static Type type1 = typeof(List<>);
 	private static Type type2 = typeof(Generics.MyArray<>);
 	private static Type type3 = typeof(List<>.Enumerator);
+	private static Type type4 = typeof(Generics.MyArray<>.NestedClass<>);
+	private static Type type5 = typeof(List<int>[]);
 	
 	public static void MethodWithConstraint<T, S>() where T : class, S where S : ICloneable, new()
 	{