replace empty slice literal with var
#3337
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An empty slice can be represented by `nil` or an empty slice literal. They are functionally equivalent — their `len` and `cap` are both zero — but the `nil` slice is the preferred style. For more information about empty slices, see [Declaring Empty Slices](https://github.com/golang/go/wiki/CodeReviewComments#declaring-empty-slices).
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An empty slice can be represented by
nilor an empty slice literal. They arefunctionally equivalent — their
lenandcapare both zero — but thenilslice is the preferred style. For more information about empty slices,
see Declaring Empty Slices.