disable output train info on station

[Trigun]

hello
i tried to make a simple fluid oil load with a not full cargo in this way

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the problem is that isn't universal since i need to add the combinator for remove the train data, every time (always same combinator)
is possible to add a flag in the input combinator for disable/enable that output ?
i think 99% of the time that value is always useless, only useful if u have some kind of mixed trains/stations in the same network and you need to manage (in that case you need to read that) but except that case i don't see the utility