Updating generator to fix PHP74 related bug

[funkjedi]

With PHP74 deprecation warnings are thrown when using any of the generated classes which don't have parents.

Deprecated: Cannot use "parent" when current class scope has no parent

This updates the generator to check if the class is a subclass when appending the jsonSerialize method.

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#382 #383

[viable-hartman]

Greetings! I see this has been approved already, and I've tested this fix successfully locally.

Any idea when this will go out in a release for composer installs as I'd really love to start running PHP 7.4 in my production environment. This is the only library holding me up ATM.

Great work and Thanks!

[ghost]

I'm in the same boat. It would be a great help to see this in a release soon.

Thanks so much!

[saqijaan]

@TCURT15 could you please merge this pull request. we have issues with php 7.4 version and waiting for this fix to be released.

[hui591463265]

waiting for this fix, please merge it in

[taufpate]

@TCURT15 please! could you please merge this pull request? it's important!

[TCURT15]

I do not have the permission nor ability to merge the pull request. I accidentally approved the changes when looking at them. I am in the same boat as everyone else.

[mav2287]

@funkjedi are you planning on doing a similar fix for PHP 8.0? It looks like this fixes it on 7.4, but for some reason the parent error comes back in php 8.0.