pFusX: Added test for unknown receiver well.
pFusX: Added test for unknown receiver well.

Had to manually test this by breaking the CSV temporarily.
Otherwise, we need to make a test fixture that is missing the
receiver wells just for this test.

OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons_sdk,Opentrons/labware,OpenTrons/opentrons-api,OpenTrons/opentrons-api