Fix: parse object ids are only being appended to requests that include both a module and a class

I'm finding that object ids are only being appended to requests that include both a module and a class. I've tracked down the problem to the VaRestParseManager having been written to do exactly that.

This is a problem for some parse requests, such as the one used for updating users. This request only requires the class and object id to be defined:

https://www.parse.com/docs/rest#users-updating