Dry run tx before submitting

[rstormsf]

Scenario:

1. Deploy eth contract with fallback revert.
   https://rinkeby.etherscan.io/address/0x059a39f805c36992190499f60381689aecfa9fa3#contracts
2. Using gnosis's UI, submit a withdraw tx to that address

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result:
UI doesn't even try to notify the user that it won't be possible to withdraw to that address.
Issue#2:
when you try to execute the tx, you get the error:

Solution:
Try to eth_call to see if the tx will succeed ( dry-run the tx)