Missing data when transaction reverts in Web3.py breaks gas estimates

[adzialocha]

Estimating the gas fees of safe transactions fail in the relayer with the following error:

2021-02-19 14:29:20,922 [DEBUG] [MainProcess] Getting response HTTP. URI: https://dark-frosty-field.xdai.quiknode.pro/, Method: eth_call, Response: {'jsonrpc': '2.0', 'error': {'code': -32015, 'message': 'VM execution error.', 'data': 'Reverted 0x08c379a000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000d2fb'}, 'id': 509}
2021-02-19 14:29:20,922 [WARNING] [MainProcess] https://relay.circles.garden/api/v2/safes/0xe516F18f362Dd45892f2e32FC0643164F5179BD3/transactions/estimate/ - Exception: AttributeError: 'str' object has no attribute 'get' - Data received {'safe': '0xe516F18f362Dd45892f2e32FC0643164F5179BD3', 'data': '0xa2e62045', 'to': '0x75bb5e5029A752faeF0716929b7384D0bC78DE88', 'value': 0, 'operation': 0, 'gas_token': '0x0000000000000000000000000000000000000000'}

Please check related issue for more details: safe-global/safe-eth-py#26

[adzialocha]

This error propagated up to Web3.py ethereum/web3.py#1888 and got fixed with a temporary workaround in release 4.1.6.

Will still keep the ticket open for the future when the library issue has been resolved.