fixed #1128 : owner defined when a map is created by SaveAsPlugin

[MV88]

Added the definition of the attribute owner

[coveralls]

Coverage remained the same at 80.559% when pulling b85f3bf on MV88:iss1128 into f0c5e6b on geosolutions-it:master.

[offtherailz]

Let's try if save plugin needs also these changes before merge.

[MV88]

Actually the save Plugin updates only the data property of the Resource MAP.
So if the owner wasn't defined it remains undefined.
Since this PR will be merged we can use the following instructions to display the permission editor for map's owner:

• the owner should open the map (that is not displaying the permission editor)
• use the saveAs option (from burger menu) to duplicate the map (with a different name)
• go back to the home deleting the old map.

[offtherailz]

Ok, let's keep this in mind.