Dont accept returned sales without document

If the sale does not have a client, or the client does not have a document,
dont accept the sale return depending on the parameter configuration.
Another patch will allow to indicate the client if the sale does not have a
client.

Change-Id: I13a9701d79dbaf9da0da660b5cec2cd3f8fa8edd
Fixes: http://bugs.async.com.br/show_bug.cgi?id=5655