fix for model specified fetch requests

there may be more, but these are the changes I found when having a fetch request specified in the model

templates/machine.swift.motemplate

@@ -136,17 +136,17 @@ class _<$managedObjectClassName$>: <$customSuperentity$> {
         return self.fetch<$FetchRequest.name.initialCapitalString$>(managedObjectContext<$foreach Binding FetchRequest.bindings do2$>, <$Binding.name$>: <$Binding.name$><$endforeach do2$>, error: nil)
     }
 
-    class func fetch<$FetchRequest.name.initialCapitalString$>(managedObjectContext: NSManagedObjectContext!<$foreach Binding FetchRequest.bindings do2$>, <$Binding.name$>: <$Binding.type$><$endforeach do2$>, error outError: NSErrorPointer) -> [AnyObject] {
-        let model = managedObjectContext.persistentStoreCoordinator.managedObjectModel
-        let substitutionVariables = [<$if FetchRequest.hasBindings$><$foreach Binding FetchRequest.bindings do2$>
+    class func fetch<$FetchRequest.name.initialCapitalString$>(managedObjectContext: NSManagedObjectContext!<$foreach Binding FetchRequest.bindings do2$>, <$Binding.name$>: <$Binding.type$><$endforeach do2$>, error outError: NSErrorPointer) -> [AnyObject]! {
+        let model = managedObjectContext.persistentStoreCoordinator!.managedObjectModel
+        let substitutionVariables : [NSObject : AnyObject] = [<$if FetchRequest.hasBindings$><$foreach Binding FetchRequest.bindings do2$>
             "<$Binding.name$>": <$Binding.name$>,
 <$endforeach do2$><$else$>:<$endif$>]
 
         let fetchRequest = model.fetchRequestFromTemplateWithName("<$FetchRequest.name$>", substitutionVariables: substitutionVariables)
         assert(fetchRequest != nil, "Can't find fetch request named \"<$FetchRequest.name$>\".")
 
         var error: NSError? = nil
-        let results = managedObjectContext.executeFetchRequest(fetchRequest, error: &error)
+        let results = managedObjectContext.executeFetchRequest(fetchRequest!, error: &error)
 
         if error != nil {
             outError.memory = error