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Docstring for urlunparse says:
 """Put a parsed URI back together again. This may result in a
 slightly different, but equivalent URI, if the URI that was parsed
 originally had redundant delimiters, e.g. a ? with an empty query
 (the draft states that these are equivalent)."""
"Draft" here refers to RFC 1808, superseded by 3986. However, RFC 3986
(section 6.2.3) states:
"Normalization should not remove delimiters when their associated
component is empty unless licensed to do so by the scheme 
specification. For example, the URI "http://example.com/?" cannot be 
 assumed to be equivalent to any of the examples above. Likewise, the 
 presence or absence of delimiters within a userinfo subcomponent is 
 usually significant to its interpretation. The fragment component is 
 not subject to any scheme-based normalization; thus, two URIs that 
differ only by the suffix "#" are considered different regardless of 
the scheme."
I guess we need some tests here to check compliance.