Yogesh Gaikwad d5acb15a71
[Backport] Initialize document subset bit set cache used for DLS (#46211) (#46359)
This commit initializes DocumentSubsetBitsetCache even if DLS
is disabled. Previously it would throw null pointer when querying
usage stats if we explicitly disabled DLS as there would be no instance of DocumentSubsetBitsetCache to query. It is okay to initialize
DocumentSubsetBitsetCache which will be empty as the license enforcement
would prevent usage of DLS feature and it will not fail when accessing usage stats.

Closes #45147
2019-09-05 14:34:19 +10:00
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