fix(Memcache-OccService): use "is_array" to support "false" from "cache->get" #632
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Resolves #631
For some reason Memcache backend can return
falseand not null on some internal error during NC<->Memcache communication.For now we'll only fix this where the issue was reported, but we should probably do it everywhere else in a future PR (or change the behavior in the server repository).