git-remote-testgit: only push for non-local repositories

Trying to push for local repositories will fail since there is no
local checkout in .git/info/... to push from as that is only used for
non-local repositories (local repositories are pushed to directly).

This went unnoticed because the transport helper infrastructure does
not check the return value of the helper.

Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-remote-testgit.py

@@ -146,7 +146,9 @@ def do_export(repo, args):
 
     update_local_repo(repo)
     repo.importer.do_import(repo.gitdir)
-    repo.non_local.push(repo.gitdir)
+
+    if not repo.local:
+        repo.non_local.push(repo.gitdir)
 
 
 COMMANDS = {