Set novelty to the threshold when ProximityArchive is empty #2481

Job	Run time
test (ubuntu-latest, 3.12)	1m 29s
coverage	1m 45s
test (macos-latest, 3.12)	1m 24s
examples	3m 5s
pin	2m 44s
test (windows-latest, 3.12)	3m 54s
tutorials_list	5s
docs	2m 15s
benchmarks	1m 45s
pre-commit	1m 6s
tutorials (tutorials/arm_repertoire.ipynb)	1m 3s
tutorials (tutorials/cma_mae.ipynb)	8m 12s
tutorials (tutorials/features/example.ipynb)	1m 1s
tutorials (tutorials/fooling_mnist.ipynb)	4m 14s
tutorials (tutorials/lsi_mnist.ipynb)	8m 41s
tutorials (tutorials/lunar_lander.ipynb)	9m 26s
tutorials (tutorials/scalable_cma_mae.ipynb)	4m 42s
deploy	0s
	56m 51s

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