Bugfix state with zero balance

Signed-off-by: Julien Riou <julien@riou.xyz>

main.py

@@ -79,7 +79,7 @@ def main():
             last_balance, last_transaction = handler.watch_miner(address=config['miner'],
                                                                  last_balance=pool_state.get('balance'),
                                                                  last_transaction=pool_state.get('payment'))
-            if last_balance:
+            if last_balance is not None:
                 logger.debug(f'saving {pool} miner balance to state file')
                 state.write(pool_name=pool, miner_balance=last_balance)
             if last_transaction:

state.py

@@ -22,7 +22,7 @@ class State:
             content[pool_name] = {}
         if block_number:
             content[pool_name]['block'] = block_number
-        if miner_balance:
+        if miner_balance is not None:
             content[pool_name]['balance'] = miner_balance
         if miner_payment:
             content[pool_name]['payment'] = miner_payment