bug: fix AntminerOld board parsing

pyasic/miners/backends/antminer.py

@@ -597,7 +597,6 @@ class AntminerOld(CGMiner):
                 pass
 
         if rpc_stats is not None:
-            try:
             board_offset = -1
             boards = rpc_stats["STATS"]
             if len(boards) > 1:
@@ -610,9 +609,7 @@ class AntminerOld(CGMiner):
                 if board_offset == -1:
                     board_offset = 1
 
-                    for i in range(
-                        board_offset, board_offset + self.expected_hashboards
-                    ):
+                for i in range(board_offset, board_offset + self.expected_hashboards):
                     hashboard = HashBoard(
                         slot=i - board_offset, expected_chips=self.expected_chips
                     )
@@ -628,7 +625,7 @@ class AntminerOld(CGMiner):
                     hashrate = boards[1].get(f"chain_rate{i}")
                     if hashrate:
                         hashboard.hashrate = AlgoHashRate.SHA256(
-                                hashrate, HashUnit.SHA256.GH
+                            float(hashrate), HashUnit.SHA256.GH
                         ).into(self.algo.unit.default)
 
                     chips = boards[1].get(f"chain_acn{i}")
@@ -638,8 +635,6 @@ class AntminerOld(CGMiner):
                     if (not chips) or (not chips > 0):
                         hashboard.missing = True
                     hashboards.append(hashboard)
-            except (LookupError, ValueError, TypeError):
-                pass
 
         return hashboards