Batcher hangs at batch_size=0

[divyanshk]

🐛 Describe the bug

Repro

node = IterableWrapper(range(10))
node = ParallelMapper(node, map_fn=lambda x: x**2, num_workers=3, method="thread")
node = Batcher(node, batch_size=0)
loader = Loader(node)
result = list(loader)
...

Versions

v0.11