NewStringList with an empty slice creates a list containing a single empty string

[svend]

Calling NewStringList with an empty slice creates a non-empty list (containing a single emtpy string). This means an empty list cannot be represented using StringList.

There are tests showing the behavior here:

svend@882ef6e

--- FAIL: TestStringList_empty_slice (0.00s)
    string_list_test.go:37: Expected [], got [""]
--- FAIL: TestStringList_empty_slice_length (0.00s)
    string_list_test.go:50: Expected length of [] to be 0, got 1
FAIL

[svend]

This was fixed by #3239

[ghost]

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