title: Mogenerator error on deleting a core data object attribute
body: <p>I'm using xcode 5 and mogenerator. I get a code generation error from mogenerator if I delete a certain attribute from an object in my model. I can delete other attributes from this object as well as delete other attributes from other objects with no problems. </p>
  
  <p>The error is:</p>
  
  <pre><code>Assertion failed: (relationship), function -[NSEntityDescription(customBaseClass) _resolveKeyPathType:], file /Users/wolf/code/github/mogenerator/mogenerator.m, line 182.
  </code></pre>
  
  <p>The object in the model is:</p>
  
  <p><img src="https://i.stack.imgur.com/2Qoyv.png" alt="enter image description here"></p>
  
  <p>The problem attribute is the highlighted one, permanentID, which is configured as a non-optional int32 with a default of 0.</p>
  
  <p>Just changing the spelling of the name gives the mogenerator build error. The error remains if I version the model and delete the attribute in the new version. I've seen that this error has been associated with fetches involving a variable, but I don't think that's the case here. I have reinstalled both mogenerator and xcode but the error persists.</p>
  
  <p>Can anyone help me identify what the problem is?</p>