Fix crash when placing cable plates (#534)

coil

2020-03-15 0e10e8360d6fa5aa6cbb86870b6244e8818d7dc8

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local S = technic.getter
 
function technic.register_extractor(data)
    data.typename = "extracting"
    data.machine_name = "extractor"
    data.machine_desc = S("%s Extractor")
    technic.register_base_machine(data)
end