Add support for ignoring nil values in Jbuilder scope

[moritonal]

Okay, this isn't clear to merge yet. I'm doing this to see how the Actions run because I think there's currently a bug in it's building.

[moritonal]

Okay, so it's not just me, the actions are all failing on

/home/runner/work/jbuilder/jbuilder/vendor/bundle/ruby/3.0.0/gems/activesupport-7.0.8.7/lib/active_support/logger_thread_safe_level.rb:12:in `<module:LoggerThreadSafeLevel>': uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger (NameError)
	from /home/runner/work/jbuilder/jbuilder/vendor/bundle/ruby/3.0.0/gems/activesupport-7.0.8.7/lib/active_support/logger_thread_safe_level.rb:9:in `<module:ActiveSupport>'

[moritonal]

Okay, Ruby isn't my primary language so any advice is welcome on how to improve this. But it should fix up the issue whereby nested null's aren't processed correctly.

[moritonal]

Attempts to solve #363