handle variants queries gracefully when not using gohan #96
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(Redmine #2190)
Some Bento instances do not have variants data, and if they have a beacon UI, the variants portion of the UI is turned off. A variants query to any of these beacons is interpreted as an error, since it suggests a misconfigured UI.
However in the context of a beacon network, it should be considered normal to receive requests about variants when none are available. This pr replaces the previous error response with a zero results response, along with a short message.