Felix Arntz 4572bb0988 Multisite: Improve performance by caching not found lookups for sites and networks.
With this change, the result of a site or network lookup by ID will be cached even if the ID does not exist. When a new site or network is created, the cache for the respective new ID is cleared.

Props mnelson4, nielsdeblaauw.
Fixes #42251.


git-svn-id: https://develop.svn.wordpress.org/trunk@45910 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-29 12:41:45 +00:00
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