Support zero amounts and priority with finance update

[llewelld]

Summary

The finance update command checks whether a parameter has been passed and only updates the value if it has. With the previous implementation an existence check is made. This masks out None values, but also masks out zero values. In order to support zero values, an explicit check for None is needed.

This changes the check in this way to allow for a zero amount or zero priority to be passed as a parameter.

Issues

Fixes #24

Reviewer

This change allows zero priority and amount. But maybe other values (ticket?) should have an explicit None check as well? I wasn't certain about this.

How to run

Create a finance row (not on a production system):

rctab sub finance create --subscription-id ABC --date-from 2024-12 --date-to 2024-12 --amount 100 --finance-code DEF --ticket GHI --priority 100

Get the finance row ID:

rctab sub finance list ABC

Find the finance row just created and replace the <FIN_ID> values below with the value shown in the finance-id field.

Update the amount and priority to attempt to set them to zero:

rctab sub finance update --finance-id <FIN_ID> --subscription-id ABD --amount 0 --priority 0

Check that the amount and priority are now set to zero:

rctab sub finance get --finance_id <FIN_ID>

[llewelld]

For the failed pipelines, is this something I need to fix? It looks like the missing API keys are on the Turing's side.