Fix iced_wgpu freezing on empty layers
#1996
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The `render` method would return when an empty layer is encountered without explicitly dropping the `RenderPass` (necessary because we use `ManuallyDrop`), which would then leak memory and freeze `wgpu` until the surface was recreated.
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The
rendermethod would return when an empty layer was encountered without explicitly dropping theRenderPass(necessary because we useManuallyDrop), which would then leak memory and freezewgpuuntil the surface was recreated.