can someone explain why `generate_key_image_helper_precomp` should generate a key image and return true when it does not have the spend key in memory? github.com/monero-project/monero/bl…yptonote_format_utils.cpp#L299-L304

Only thing I can think of is maybe a hardware wallet (or offline wallet) will ignore whatever secret key is passed into `generate_key_image` later on.. but then why even pass in `in_ephemeral.sec` when it has a null value set? confused.. it doesn't seem like that value is ignored here e.g. : github.com/j-berman/monero/blob/b32…/src/device/device_ledger.cpp#L1294

main question is: what value is there in a key image generated from a null spend key? seems to not be useful at all

or null ephemeral secret key*, rather