fixed missing options

lib/associations/has-many-single-linked.js

@@ -15,19 +15,22 @@ module.exports = (function() {
 
   HasManySingleLinked.prototype.injectSetter = function(emitter, oldAssociations, newAssociations) {
     var self    = this
+      , options = this.options || {}
 
     // clear the old associations
     oldAssociations.forEach(function(associatedObject) {
-      associatedObject[self.__factory.identifier] = self.options.omitNull ? '' : null
+      associatedObject[self.__factory.identifier] = options.omitNull ? '' : null
       associatedObject.save()
     })
 
     // set the new one
-    var chainer = new Utils.QueryChainer
+    var chainer = new Utils.QueryChainer()
+
     newAssociations.forEach(function(associatedObject) {
       associatedObject[self.__factory.identifier] = self.instance.id
       chainer.add(associatedObject.save())
     })
+
     chainer
       .run()
       .success(function() { emitter.emit('success', newAssociations) })