Entity engine optimization: Use SELECT * when the fields to select have not been specified.

There was some code to check for this, but it was testing a "fields to select" List that was never empty, so SELECT * was never used.


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1486552 13f79535-47bb-0310-9956-ffa450edef68