Don't assign a resource color to top level resources unless they either cannot have subresources or can have them but don't.
Don't assign a resource color to top level resources unless they either cannot have subresources or can have them but don't.

kolab/issue2260

svn path=/branches/kdepim/enterprise/kdepim/; revision=769476

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi