[TouchRunner] Fix unused variable warning by only defining the variab…

…le when it's used. (#71)

NUnitLite/TouchRunner/TestCaseElement.cs

@@ -46,10 +46,10 @@ public TestCaseElement (TestMethod testCase, TouchRunner runner)
 				if (!Runner.OpenWriter (Test.FullName))
 					return;
 
-				var suite = (testCase.Parent as TestSuite);
 #if NUNITLITE_NUGET
 				Run ();
 #else
+				var suite = (testCase.Parent as TestSuite);
 				var context = TestExecutionContext.CurrentContext;
 				context.TestObject = Reflect.Construct (testCase.Method.ReflectedType, null);