Boris Feld <boris.feld@octobus.net> [Tue, 30 May 2017 19:43:14 +0200] rev 2526
template: fix precursors template for older mercurial version
In mercurial 4.1 and below templatekw._hybrid require the gen argument to be different
than None. Manually compute the same default output for these older mercurial
versions.