fix test

Author: srawlins

test/mustachio/aot_compiler_render_test.dart

@@ -16,10 +16,9 @@ void main() {
     var rendered = renderFoo(foo);
     expect(rendered, equals('''
 <div>
-
     <div class="partial">
     l1: [1, 2, 3]</div>
-    s1: hello    b1: false</div>'''));
+    s1: hello    b1? no    l1:item: 1item: 2item: 3    baz:baz is null</div>'''));
   });
 
   // TODO(srawlins): Add waaay more end-to-end render tests. These are