Smart Contracts: when contract does not output a tx (even if it crash), a transaction should still be created

[bchamagne]

Is your feature request related to a problem?

Miners should get fees even if a contract does nothing or crash. This is an anti-spam solution.

Describe the solution you'd like

ps: we probably need to copy the fields from previous transaction ps: we probably need to change the get_calls() function as well

Additional context

Epic: #608