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Azure metadata API may return empty zone sometimes. If that happens shard-0 gets empty string as its rack, but propagates UNKNOWN_RACK to other shards. Empty zones response should be handled regardless. refs: #12185 Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Closes #12274 Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>