[Device] GetAll: do not fail if the DMR returns an error for GetPositionInfo
[Device] GetAll: do not fail if the DMR returns an error for GetPositionInfo

Fix issue 92: <https://github.com/01org/dleyna-renderer/issues/92>

Signed-off-by: Regis Merlino <bf92b28820f6093e0f55b8f19f2762bc8cee2f98@intel.com>

UIKit0/dleyna-renderer,puleglot/dleyna-renderer,debarshiray/dleyna-renderer,UIKit0/dleyna-renderer,lferrandis/dleyna-renderer,01org/dleyna-renderer,debarshiray/dleyna-renderer,rmerlino/dleyna-renderer,rmerlino/dleyna-renderer,debarshiray/dleyna-renderer,em-/dleyna-renderer,em-/dleyna-renderer,01org/dleyna-renderer,UIKit0/dleyna-renderer,lferrandis/dleyna-renderer,puleglot/dleyna-renderer,puleglot/dleyna-renderer,KobaltRo/dleyna-renderer,debarshiray/dleyna-renderer,jku/dleyna-renderer,lferrandis/dleyna-renderer,jku/dleyna-renderer,01org/dleyna-renderer,KobaltRo/dleyna-renderer,KobaltRo/dleyna-renderer,rmerlino/dleyna-renderer,em-/dleyna-renderer,01org/dleyna-renderer,rmerlino/dleyna-renderer,jku/dleyna-renderer,em-/dleyna-renderer,lferrandis/dleyna-renderer