fix failing test in torrentdownloader

codex/bittorrent/torrentdownloader.nim

@@ -218,7 +218,6 @@ proc getNext*(
   except CancelledError as e:
     trace "Getting next block from downloader cancelled"
     raise e
-    # return success((-1, newSeq[byte]()))
   except CatchableError as e:
     warn "Could not get block from local store", error = e.msg
     return failure("Could not get block from local store: " & e.msg)

tests/codex/bittorrent/testtorrentdownloader.nim

@@ -235,6 +235,5 @@ asyncchecksuite "Torrent Downloader":
 
     assert dataFut.finished
 
-    let (blockIndex, data) = dataFut.read.tryGet()
-    check blockIndex == -1
-    check data.len == 0
+    expect CancelledError:
+      discard await dataFut