[issue15473] importlib no longer uses imp.NullImporter

[Nick Coghlan]

Nick Coghlan added the comment:

See the porting notes: http://docs.python.org/dev/whatsnew/3.3.html#porting-python-code

With the removal of the implicit default finder, the 3.3 semantics are that both None *and* imp.NullImporter mean "There is no importer for this path".

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