Rails: read_multi and dalli

Be careful when using read_multi with dalli: it may return nil-valued key instead of the correct key.

The issue is tracked here and thanks to this I dropped the read_multi usage in moebooru and used the much simpler (and most likely slower) single fetch (per entry) instead. There’s alternative way to use it – do a read_multi and refetch whatever missing/nil-keyed but apparently I’m too lazy to do it.

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