don't exit on empty tree

src/main.rs

@@ -950,10 +950,6 @@ async fn write_commit(config:WriteCommitConfig,b:Result<AResult<(AssetVersion,De
 			Ok(_)=>(),
 			Err(e)=>println!("tree_index.update_all error: {}",e),
 		}
-		if tree_index.len()==0{
-			println!("tree_index.len()==0");
-			return Ok(());
-		}
 		tree_index.write()?;
 		tree_index.write_tree()?
 	};