Set novelty to the threshold when ProximityArchive is empty (#479) #2482

Job	Run time
coverage	1m 39s
test (ubuntu-latest, 3.12)	1m 26s
pin	2m 29s
test (macos-latest, 3.12)	1m 31s
pre-commit	1m 6s
test (windows-latest, 3.12)	4m 56s
benchmarks	1m 46s
docs	1m 48s
examples	3m 1s
tutorials_list	6s
tutorials (tutorials/arm_repertoire.ipynb)	1m 13s
tutorials (tutorials/cma_mae.ipynb)	8m 24s
tutorials (tutorials/features/example.ipynb)	1m 13s
tutorials (tutorials/fooling_mnist.ipynb)	3m 18s
tutorials (tutorials/lsi_mnist.ipynb)	8m 56s
tutorials (tutorials/lunar_lander.ipynb)	10m 19s
tutorials (tutorials/scalable_cma_mae.ipynb)	4m 18s
deploy	0s
	57m 29s

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