Fix null error from resource when request has no response.

spec/script-spec.coffee

@@ -14,6 +14,8 @@ brains.get "/script/window", (req, res)-> res.send "<script>document.title = [wi
 
 brains.get "/script/incomplete", (req, res)-> res.send "<script>1 +</script>"
 
+brains.get "/script/split", (req, res)-> res.send "<script>foo = foo ? 1 : 2; '&'; document.title = foo</script>"
+
 brains.get "/script/error", (req, res)-> res.send "<script>foo.bar</script>"
 
 brains.get "/script/order", (req, res)-> res.send """
@@ -156,6 +158,12 @@ vows.describe("Scripts").addBatch(
     zombie.wants "http://localhost:3003/script/order"
       "should run scripts in order regardless of source": (browser)-> assert.equal browser.text("title"), "ZeroOneTwo"
 
+  ###
+  "split script":
+    zombie.wants "http://localhost:3003/script/split"
+      "should run full script": (browser)-> assert.equal browser.text("title"), "1"
+  ###
+
   "using eval":
     zombie.wants "http://localhost:3003/script/eval"
       "should evaluate in global scope": (browser)-> assert.equal browser.document.title, "3"

src/zombie/browser.coffee

@@ -292,17 +292,17 @@ class Browser extends require("events").EventEmitter
     #
     # Returns the status code of the request for loading the window.
     @__defineGetter__ "statusCode", ->
-      @window.resources.first?.response.statusCode
+      @window.resources.first?.response?.statusCode
     # ### browser.redirected => Boolean
     #
     # Returns true if the request for loading the window followed a
     # redirect.
     @__defineGetter__ "redirected", ->
-      @window.resources.first?.response.redirected
+      @window.resources.first?.response?.redirected
     # ### source => String
     #
     # Returns the unmodified source of the document loaded by the browser
-    @__defineGetter__ "source", => @window.resources.first?.response.body
+    @__defineGetter__ "source", => @window.resources.first?.response?.body
 
     # ### browser.cache => Cache
     #