fix: prevent KeyError when popping an unknown property

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Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Related Issue	fixes https://github.com/algolia/algoliasearch-client-python/pull/550 fixes https://github.com/algolia/algoliasearch-client-python/issues/544
Need Doc update	no

https://algolia.atlassian.net/browse/CR-2497 https://algolia.atlassian.net/browse/DI-676

Describe your change

We ensure the key in present before calling pop, to prevent a KeyError returned if it's not found.