Wrong assertion for user project

[fcomte]

Onyxia make the assertion that user project is the first one of the list. This is a wrong assertion, we are going to support an onyxia configuration which allow only project and no user namespace.

The api return for each project a group name for share project and return nothing for a user project. This is the good assertion to detect if it's a share project or a personnal space.

[fcomte]

I think we should assert :

• if there is no personnal project (ie they all have a group name) we should store personnal data as if there is no vault at all. But still keeping all other vault fonctionnality