use try in wallet blockchain

chia/wallet/wallet_blockchain.py

@@ -198,7 +198,7 @@ def contains_block(self, header_hash: bytes32, height: Optional[uint32] = None)
         that we have added but no longer keep in memory.
         """
         if height is None:
-            block_rec = self.block_record(header_hash)
+            block_rec = self.try_block_record(header_hash)
             if block_rec is None:
                 return False
             height = block_rec.height