fix: add nullptr checks for new_pyobject_id [backport 2.10] #54596

Job	Run time
build-and-publish-latest-snapshot-image	0s
test_unit (dd-lib-python-init-test-django)	3m 26s
test_unit (dd-lib-python-init-test-django-gunicorn)	2m 59s
test_unit (dd-lib-python-init-test-django-gunicorn-alpine)	3m 3s
test_unit (dd-lib-python-init-test-django-uvicorn)	3m 7s
test_unit_no_instrumentation (dd-lib-python-init-test-django-unsupported-python)	3m 8s
test_unit_no_instrumentation (dd-lib-python-init-test-django-unsupported-package)	3m 19s
test_unit (dd-lib-python-init-test-django-no-perms)	3m 6s
test_unit (dd-lib-python-init-test-django-pre-installed)	3m 16s
test_unit (dd-lib-python-init-test-django-unsupported-package-force)	3m 32s
build-and-publish-test-image / wait_for_package	9s
build-and-publish-test-image / build_push / build_push	11m 34s
test-runner-test (dd-lib-python-init-test-django)	2m 52s
test-runner-test (dd-lib-python-init-test-django-gunicorn)	3m 1s
test-runner-test (dd-lib-python-init-test-django-uvicorn)	3m 0s
	49m 32s

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