url: do not continue HTTP authentication with user=None (issue6425)
I initially thought this is a py3-compat bug of passwordmgr._writedebug(),
but actually returning (None, str) pair is wrong at all. HTTP authentication
would continue with user="None" in that case.
Since registering a password of user=None should also be wrong, this patch
simply adds early return.
=== property cache ===
calllog: []
cached value (unfiltered): NOCACHE
= first access on unfiltered, should do a call
access: 0
calllog: [0]
cached value (unfiltered): 0
= second access on unfiltered, should not do call
access 0
calllog: [0]
cached value (unfiltered): 0
= first access on "visible" view, should do a call
cached value ("visible" view): NOCACHE
access: 7
calllog: [0, 7]
cached value (unfiltered): 0
cached value ("visible" view): 7
= second access on "visible view", should not do call
access: 7
calllog: [0, 7]
cached value (unfiltered): 0
cached value ("visible" view): 7
= no effect on other view
cached value ("immutable" view): NOCACHE
access: 9
calllog: [0, 7, 9]
cached value (unfiltered): 0
cached value ("visible" view): 7
cached value ("immutable" view): 9
=== unfiltered property cache ===
unficalllog: []
cached value (unfiltered): NOCACHE
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE
= first access on unfiltered, should do a call
access (unfiltered): 100
unficalllog: [100]
cached value (unfiltered): 100
= second access on unfiltered, should not do call
access (unfiltered): 100
unficalllog: [100]
cached value (unfiltered): 100
= access on view should use the unfiltered cache
access (unfiltered): 100
access ("visible" view): 100
access ("immutable" view): 100
unficalllog: [100]
cached value (unfiltered): 100
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE
= even if we clear the unfiltered cache
cached value (unfiltered): NOCACHE
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE
unficalllog: [100]
access ("visible" view): 100
unficalllog: [100, 100]
cached value (unfiltered): 100
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE
access ("immutable" view): 100
unficalllog: [100, 100]
cached value (unfiltered): 100
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE
access (unfiltered): 100
unficalllog: [100, 100]
cached value (unfiltered): 100
cached value ("visible" view): NOCACHE
cached value ("immutable" view): NOCACHE