Get error "Could not validate ABI" on ABIs including receive function

[ColonelJ]

When submitting an ABI to 4byte.directory including a receive function e.g. [{"stateMutability":"payable","type":"receive"}] you get the error contract_abi: Could not validate ABI. This receive function can simply be ignored if it is found in the input.

[bg]

Duplicate of #98 which has more context at this point even though this one was opened first. :)