[MERGE] fix relpath calls at '/'

[Aaron Bentley]

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Robert Collins wrote:

| +    assert len(base), 'Length of base must be > 1 (to start with /).'

Code doesn't match text.  Would be better as

~    assert len(base) > 0, 'Length of base must be > 0 (to start with /).'

(and on Windows, the shortest absolute path is 3 letters.)

I also wonder whether ensuring netloc couldn't happen when registering
protocols.

Aaron
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