[fpc-pascal] Null values with JSON RPC

[Ryan Joseph]

> On Aug 8, 2020, at 7:37 PM, Michael Van Canneyt <michael at freepascal.org> wrote:
> 
> Confirm there was an error. Fixed, and added testcase.
> 
> I also added jdoNullClearsProperty; a null will then clear the property with
> the 'natural' empty value. It has precedence over jdoIgnoreNulls.

Thanks again, I couldn't figure out what I did wrong! Btw, can I just rebuild the fpc-json package? I ended up rebuilding everything to get just that one change. The project was started using lazbuild so I'm kind of tied into that build system even though I don't understand how it works very well. Normally I would just add paths to directories and I need but that's not an option with lazbuilds package system.

Regards,
	Ryan Joseph