we have to render something even if the member is invalid
fix member role_empty validation

because add_on_empty was used, it failed to invalidate the member object
if there all roles are marked for deletion (but are still present)
add spec for non-empty roles validation in Member
add CHANGELOG entry, because we have fixed #1505
fix project settings cuke
Merge pull request #273 from opf/feature/rails3_do_not_remove_member_when_last_role_was_removed

Feature/rails3 do not remove member when last role was removed