non crashing benchmark

Author: jack60612

tools/generate_chain.py

@@ -14,7 +14,7 @@
 import click
 import zstd
 from chia_rs import SpendBundle
-from chia_rs.chia_rs import FullBlock
+from chia_rs.chia_rs import FullBlock, G2Element
 from chia_rs.sized_bytes import bytes32
 from chia_rs.sized_ints import uint8, uint32, uint64
 
@@ -217,9 +217,15 @@ async def main(length: int, fill_rate: int, profile: bool, block_refs: bool, out
                         pool_puzzlehash = wallet.get_new_puzzlehash()
                         prev_num_blocks = len(blocks)
                         # Get next spend bundle from mempool
-                        res_bundle = mempool_manager.create_bundle_from_mempool(prev_tx_block.header_hash)
-                        assert res_bundle is not None
-                        spend_bundle, _ = res_bundle
+                        spend_bundle: SpendBundle
+                        if spends != 0:
+                            res_bundle = mempool_manager.create_bundle_from_mempool(prev_tx_block.header_hash)
+                            assert res_bundle is not None
+                            spend_bundle, _ = res_bundle
+                        else:
+                            # no spends to make
+                            spend_bundle = SpendBundle([], G2Element())
+
                         blocks = bt.get_consecutive_blocks(
                             1,
                             blocks,