Can the library handle non-conforming devices that send only 2 bytes of data in EMCY?

[0x53A]

EMCY is defined to have a total of 8 data bytes, 5 of them "device specific".

Other sources confirm that EMCY must have exactly 8 bytes, with 5 manufacturer specific bytes.

Nonetheless, one of my devices sends a 5-byte EMCY, with two bytes in the device-specific data block.

This causes the line "unpack requires a buffer of 8 bytes" to appear in the terminal.

Timestamp: 1763198285.325304 ID: 0fe S Rx DL: 2 30 81

I've traced the error to https://github.com/canopen-python/canopen/blob/master/canopen/emcy.py#L13.

Would you accept a PR that changes that code to allow non-5-byte manufacturer data?