Zero-amount byproduct exchanges present in cutoff final data

[cmutel]

For example:

{
    "unit": "kg",
    "variable": "inert_filler",
    "tag": "intermediateExchange",
    "amount": 0.0,
    "formula": "(abs(flyash)+abs(bshale)+abs(silica_fume))*0",
    "type": "byproduct",
    "conditional exchange": false,
    "id": "0a484a1e-8eb0-4e63-857f-f58c790cab91",
    "production volume": {
        "amount": 0.0
    },
    "name": "inert filler",
    "byproduct classification": "allocatable product"
}

This seems to be due to inconsistencies in how to handle zero-amount exchanges.