D3145: context: catch right exceptions from namespace lookup (API)

[yuja (Yuya Nishihara)]

yuja requested changes to this revision.
yuja added a comment.
This revision now requires changes to proceed.


  It seems incorrect to me to catch LookupError of `node` returned by
  a namespace API, not by a user-specified node value.
  
  I think the reason why catching `RepoLookupError` here was that
  we historically used `repo.branchtip(changeid)`.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3145

To: martinvonz, #hg-reviewers, yuja
Cc: yuja, mercurial-devel