Shard Refining - Offering 0 shards counts towards ore requirements

[shut scaffold]

Observed Behavior: when a worker is assigned to generate ore of a given tier, it can offer 0 shards of a selected type and the refiner accepts it towards the ore refine process
Expected Behavior: at least one shard must be offered of each selected type in order to qualify as "shards of a different type"

(if this is because of rounding: it should round up to the first whole shard in cases where the rounding leads to a value between 0 and 1)