option to exclude null fields in the source file/layer from updating data

[Growlbeard]

i really like your tool, it helps me with updating large amounts of data in an attribute table. thank you for that. however, i have a problem when it comes to null fields. i prepare my data before the update, and in some cases, i have to leave some fields as null. when updating, this leads to existing data in my attribute table being set to null because the field in the source file is null. therefore, i was wondering if it might be possible for you to add an option that allows null fields in the source data to be skipped during the update.

[gacarrillor]

Thanks for the feature request, for me it makes sense.
Would you be able to fund this feature?

[Growlbeard]

unfortunately i cannot fund this, as it is not a profit-oriented project

[gacarrillor]

No worries, let's leave it open anyway in case there is more people interested in this enhancement.

[Growlbeard]

i did it myself. if you want, i can send you the new *.py. how would you like me to send it to you?

[gacarrillor]

A PR would be welcome.

[Growlbeard]

i'm not very experienced with github, but i hope i did everything correctly.

[gacarrillor]

Thanks, there are unit tests failing in your PR.
Could you have a look at them?

You can find how to run them locally (provided that you have docker compose installed) in the README.