Removed Empty selectors.
Revert "Removed Empty selectors."

This reverts commit 4c5f807f7840c6ebdd6451b84559801ae8b2a0fc.
Revert "Revert "Removed Empty selectors.""

This reverts commit 8390d09550f46c18dd5aeb2694e83ec9f4750173.
Sunburst Remove empty selectors
Wombat removed empty selectors
ZenBurn remove empty selectors.