hgweb: explicitly tests for None
Changeset
7dafa8d0e006 removed the mutable default value, but did not explicitly
tested for None. Such implicit testing can introduce semantic and performance
issue. We move to an explicit testing for None as recommended by PEP8:
https://www.python.org/dev/peps/pep-0008/#programming-recommendations
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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