Fix check for force true in sync

lib/sequelize.js

@@ -387,7 +387,7 @@ module.exports = (function() {
     // Topologically sort by foreign key constraints to give us an appropriate
     // creation order
 
-    if (this.options.force) {
+    if (options.force) {
       chainer.add(this, 'drop')
     }
 
@@ -408,7 +408,11 @@ module.exports = (function() {
     return new Utils.CustomEventEmitter(function(emitter) {
       var chainer = new Utils.QueryChainer()
 
-      self.daoFactoryManager.forEachDAO(function(dao) { chainer.add(dao, 'drop', []) }, { reverse: false})
+      self.daoFactoryManager.forEachDAO(function(dao) { 
+        if (dao) {
+          chainer.add(dao, 'drop', []) 
+        }
+      }, { reverse: false})
 
       chainer
         .runSerially()