improve test with undefined/null lookup hit using dot notation

test/_files/null_lookup_object.js

@@ -14,5 +14,18 @@
 	    	"name": "Chris",
 	        "twitter": undefined
 	    }
-    ]
+    ],
+    "favorites": {
+      "color": "blue",
+      "president": "Bush",
+      "show": "Futurama"
+    },
+    "mascot": {
+      "name": "Squid",
+      "favorites": {
+        "color": "orange",
+        "president": undefined,
+        "show": null
+      }
+    }
 })

test/_files/null_lookup_object.mustache

@@ -1,3 +1,9 @@
 {{#fobject}}
 {{name}}'s twitter: {{#twitter}}{{.}}{{/twitter}}{{^twitter}}unknown{{/twitter}}.
 {{/fobject}}
+
+{{#mascot}}
+{{name}}'s favorite color: {{#favorites.color}}{{.}}{{/favorites.color}}{{^favorites.color}}no one{{/favorites.color}}.
+{{name}}'s favorite president: {{#favorites.president}}{{.}}{{/favorites.president}}{{^favorites.president}}no one{{/favorites.president}}.
+{{name}}'s favorite show: {{#favorites.show}}{{.}}{{/favorites.show}}{{^favorites.show}}none{{/favorites.show}}.
+{{/mascot}}

test/_files/null_lookup_object.txt

@@ -1,3 +1,7 @@
 Flor's twitter: @florrts.
 Miquel's twitter: unknown.
 Chris's twitter: unknown.
+
+Squid's favorite color: orange.
+Squid's favorite president: no one.
+Squid's favorite show: none.