git-svn v1 layout migration even though there was no git-svn layout

Sometimes I accidentally try to fetch changes by doing a "git-svn fetch" in a git repository that is not connected to any SVN repository. Then git tells me that data from a previous version of git-svn exists, and migrates to a new git-svn layout.
I think this is unexpected and unintended behavior and thus I consider this to be a bug.

How to reproduce:

  $ git init tmp && cd tmp && git svn fetch
  Initialized empty Git repository in /home/jo/tmp/.git/
  Migrating from a git-svn v1 layout...
  Data from a previous version of git-svn exists, but
      .git/svn
      (required for this version (1.7.11) of git-svn) does not exist.
  Done migrating from a git-svn v1 layout
  [svn-remote "svn"] unknown

$

I would expect some output like "this is not a git-svn layout", but maybe I miss a point here?

Best regards
Jörg