Add uncancellable to the promise chain in findorcreate. Closes #3407

lib/model.js

@@ -1196,7 +1196,7 @@ module.exports = (function() {
         // If we created a transaction internally, we should clean it up
         return this.transaction.commit();
       }
-    });
+    }).uncancellable(); // Don't allow the user to cancel the chain, we want to make sure the transaction is comitted
   };
 
   /**