view mercurial/templates/rss/header.tmpl @ 39894:d739f423bf06

repo: look up nullrev context by revnum, not symbolic name

I think lookup of the 'null' symbol should be done via
scmutil.revsymbol() and repo['null'] is only supported for historical
reasons. However, repo[nullrev] is fine, so we can switch to that
instead of switching to scmutil.revsymbol('null').

Differential Revision: https://phab.mercurial-scm.org/D4780

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