simple: reverse "len(x) > 0" as "len(x) == 0" #1423
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Rather than "len(x) <= 0", which is technically correct, but not actually what most Go programmers would write, since funcs like len or cap can never return negative integers. Do the same for cap and copy, which never return negative ints either. Fixes dominikh#1422.
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(see commit message)
Fixes #1422.