Fix particles regression on DirectX

Source/Engine/Renderer/RenderList.cpp

@@ -264,6 +264,8 @@ void RenderList::AddDelayedDraw(DelayedDraw&& func)
 
 void RenderList::DrainDelayedDraws(RenderContext& renderContext)
 {
+    if (_delayedDraws.IsEmpty())
+        return;
     PROFILE_GPU_CPU_NAMED("DelayedDraws");
     for (DelayedDraw& e : _delayedDraws)
         e(renderContext);

Source/Shaders/BitonicSort.shader

@@ -68,7 +68,6 @@ void CS_IndirectArgs(uint groupIndex : SV_GroupIndex)
 	uint offset = 12 * prevDispatches;
 
 	// Generate outer sort dispatch arguments
-	UNROLL
 	for (uint j = k / 2; j > 1024; j /= 2)
 	{
 		// All of the groups of size 2j that are full