Clicking on the branch at https://trac.sagemath.org/ticket/25434 I get:
Oops… *Trac detected an internal error:* TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' There was an internal error in Trac. It is recommended that you notify your local Trac administrator with the information needed to reproduce the issue. To that end, you could a ticket. The action that triggered the error was: GET: /git-merger/b4a14f9782c9584fa79344e4902eb147810ebac5 TracGuide <https://trac.sagemath.org/wiki/TracGuide> — The Trac User and Administration Guide -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.