Ramkumar Ramachandra [off-list ref] writes:
The --import-marks option used to barf when the specified marks file
doesn't exist. Change its meaning to "read marks file if it exists" so
that callers don't have to handle bootstraping as a special case.
It is very plausible that people other than you are relying on "barf if it
does not exist" semantics, and the above does not justify breaking their
workflow.
I'd suggest making this an optional feature.