backends/wayland: Ignore blank present requests
Amends 0c974843.
The present function can be called without anything being repainted. If that happens, just ignore such present requests, there is not a lot that can be done without a wl_buffer.
Amends 0c974843.
The present function can be called without anything being repainted. If that happens, just ignore such present requests, there is not a lot that can be done without a wl_buffer.