Cleaning empty spaces or reconstructing lost ones

[rolandcahen]

For using the NA_ViewerApp it is necessary to clean all empty and test SPACES or to reconstruct destoyed ones and to lock them to their author using the right management system

[benchang02]

most poetic bug report title on github.

[jonlab]

About the empty spaces, I changed the GUI so that only non-empty spaces are shown OR spaces belonging to the current user. So, that cleans up the Spaces list without really deleting them. An empty Space does not really deserve that, no ? :-)
About lock to author, this is in progress...