Effective date cannot be optional

[lucianf]

I'm using a config file that reads effective_date from a CSV field and assigns is to the transaction via a template like this: {date}={effective_date}.

If the effective_date CSV field is empty the program crashes (ValueError: time data '' does not match format '%d/%m/%Y')

Is there any way the template assignment of the effective_date tag to be optional, ie. only take place when effective_date is actually not null?

LE: It turns out the error is only raised when there is a custom ledger_date_format (which would be applied over a null value). I still think it would be best if there was a way to only add the ={effective_date} when the date actually exists; but I don't know how to do this with python format specification (or whether it's even possible in the first place).