message: Serialise out empty map writes. Closes
diff: @@ -1676,9 +1676,15 @@ void WrappedID3D12Device::Unmap(ID3D12Resource *Resource, UINT Subresource, byte
  D3D12_RANGE range = {0, (SIZE_T)map.totalSize};
  if(pWrittenRange)
  + {
  range = *pWrittenRange;
  - if(capframe && range.End > range.Begin)
  + // clamp end if it's lower than begin
  + if(range.End < range.Begin)
  + range.End = range.Begin;
  + }
  +
  + if(capframe)
  MapDataWrite(Resource, Subresource, mapPtr, range);
  }
  