title: knockout viewmodel property undefined
body: <p>I have a simple foreach:</p>
  
  <pre><code>&lt;div id="customersArea" data-bind="foreach: people"&gt;
              &lt;div class="section" data-bind="attr: { 'personid': PersonId }" &gt;
                  &lt;div class="sectionActions"&gt;
                      &lt;div&gt;&lt;a class="action" href="#" data-bind='click: $parent.removePerson'&gt;Remove&lt;/a&gt;&lt;/div&gt;
                  &lt;/div&gt;
                  &lt;div class="sectionText"&gt;
                      &lt;span data-bind="if:LastName, text:LastName"&gt;&lt;/span&gt;
                      &lt;span data-bind="if:FirstName, text:FirstName"&gt;&lt;/span&gt;
                      &lt;span data-bind="if:MailingAddress"&gt;
                          &lt;span data-bind="with:MailingAddress"&gt;
                              &lt;span data-bind="text:StreetPartOne"&gt; &lt;/span&gt;
                              &lt;span data-bind="text:StreetPartTwo"&gt;  &lt;/span&gt;
                              &lt;span data-bind="text:City"&gt;&lt;/span&gt;
                              &lt;span data-bind="text:PostalCode"&gt;&lt;/span&gt;
                          &lt;/span&gt;
                      &lt;/span&gt;
  
                      &lt;span data-bind="if:EmailAddress, text:EmailAddress"&gt;&lt;/span&gt;
                      &lt;span data-bind="if:MainPhoneNumber, text:MainPhoneNumber"&gt;&lt;/span&gt;
                      &lt;span data-bind="if:MobilePhoneNumber, text:MobilePhoneNumber"&gt;&lt;/span&gt;
  
                  &lt;/div&gt;
  
                  &lt;div class="sectionOptions"&gt;
  
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
  </code></pre>
  
  <p>I am trying to make it such that i can bind against a model {PersonId:33} and the rest will just not render if missing. when i try it this and other ways i get</p>
  
  <pre><code>Uncaught Error: Unable to parse bindings.
  Message: ReferenceError: MailingAddress is not defined;
  Bindings value: if:MailingAddress
  </code></pre>
  
  <p>I created a simple jsfiddle to test:</p>
  
  <p><a href="http://jsfiddle.net/E7kUr/">http://jsfiddle.net/E7kUr/</a></p>