Preferences entry duplicated in database

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Configure Rapla (latest trunk or 1.8RC1) on a PostgreSQL database.
2. Open Rapla, then the administrator options, and modify any admin parameter
3. Commit the change
4. See that there are multiple rows for the same configuration role and userid 
(in this case null), sometimes with different xml_values. Which one is loaded 
by Rapla ? Sometimes commiting plugin config will not work because of this;

What is the expected output? What do you see instead?
One row in the preference table per role / user.

What version of the product are you using? On what operating system?
I've seen this on Rapla 1.8RC1 and the latest commit as of today.

Please provide any additional information below.
I have several custom plugins, but with a clean database and distribution (the 
bin downloaded from sourceforge, without any custom plugin), the problem also 
appears.

Original issue reported on code.google.com by djtwikz on 1 Dec 2014 at 10:45

[GoogleCodeExporter]

Thx for reporting fixed in master.
Will be available in 1.8 release

Original comment by christop...@gmail.com on 4 Dec 2014 at 7:54

• Changed state: Fixed

[GoogleCodeExporter]

Original comment by christop...@gmail.com on 30 Jan 2015 at 2:19

• Changed state: Verified
• Added labels: Milestone-1.8