fix(calldata): name the descriptor when conversion fails

[venugopalanvip]

Small one, found while diagnosing #345.

The message named nothing

The catch-all around v2 conversion reported:

🟠 warning: Error processing v2 ERC-7730 file None, skipping it
🔴 error: Failed processing descriptor: invalid literal for int() with base 10: 'true'

source is an optional HttpUrl and is None for a local file — which is what command_calldata passes unless --source is given, so the normal CLI path always printed file None.

That line is the only one that says which descriptor was abandoned. The exception_to_output detail underneath it carries no file, no name and no position — just the raw exception. So converting more than one descriptor gave no way to tell which had failed; I found the two descriptors behind #345 by bisecting the registry by hand, which is the sort of thing a message is supposed to save you.

Now

🟠 warning: Error processing v2 ERC-7730 descriptor pFT NFT, skipping it
🟠 warning: Error processing v2 ERC-7730 descriptor Ekubo Swap Router, skipping it

The fallback is what the descriptor calls itself, using the idiom already in this file for naming a contract in the converted output:

contract_name=descriptor.metadata.contractName or descriptor.context.id,

A source is kept beside the name when both are known — MyContract (https://…) — because a batch run wants the path as well as the name. With neither, it says <unidentified> rather than printing None.

getattr guards the context id: the exception may be raised before the contract-context check at the top of the function, so the handler must not assume which context type it has and must not raise on its own.

Tests

tests/v2/convert/calldata/test_describe.py: contractName preferred over $id, $id as fallback, name and source together, source alone, neither, and a parametrised check that the result never contains the text None — which is the defect being fixed.

Scope

v2 only. convert_erc7730_input_to_calldata.py has the same line for v1, left alone since v1 is frozen.