D593: cmdutil: removing redundant if condition in amend

[durham (Durham Goode)]

durham added a comment.


  I'd probably fold this together with the next commit.  Splitting commits is good when it increases readability or increases bisect ability.  This change is so small I think readability is fine in one commit, and the feature change is only in one commit anyway so bisectability isn't hurt.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D593

To: singhsrb, #hg-reviewers
Cc: durham, mercurial-devel