nvhost_gpu: Skip empty GPU command lists.

src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp

@@ -137,6 +137,10 @@ u32 nvhost_gpu::AllocateObjectContext(const std::vector<u8>& input, std::vector<
 }
 
 static void PushGPUEntries(Tegra::CommandList&& entries) {
+    if (entries.empty()) {
+        return;
+    }
+
     auto& dma_pusher{Core::System::GetInstance().GPU().DmaPusher()};
     dma_pusher.Push(std::move(entries));
     dma_pusher.DispatchCalls();