skip empty event chunks

src/v0.rs

@@ -932,10 +932,14 @@ pub fn serialize<W:BinWriterExt>(block:&Block,writer:&mut W)->Result<(),binrw::E
 	block_timelines.write_le(writer)?;
 	for plan in plan_order{
 		for (event_type_id,range) in plan.0.into_iter().enumerate(){
+			let num_events=range.len();
+			if num_events==0{
+				continue;
+			}
 			let event_type=EventType::from_usize(event_type_id);
 			let event_chunk_header=EventChunkHeader{
 				event_type,
-				num_events:range.len() as u32,
+				num_events:num_events as u32,
 			};
 			event_chunk_header.write_le(writer)?;
 			match event_type{