wrong info from 'git remote show ' about 'git push' configuration

[alexander barakin (aka sash-kan)]

"git remote show <remote>" shows wrong information
about not yet configured for 'git push' local ref.

steps to reproduce:

$ git init
$ git remote add origin https://github.com/git/git # for example
$ git pull origin master
$ git remote show origin
...
  Local ref configured for 'git push':
    master pushes to master (up to date)
$

but the local branch "master" is not yet configured to push to remote "master":
1. there is no section '[branch "master"]' (with required content) in the 
.git/config
2. attempt to push results in error (and that's right):
$ git push
fatal: The current branch master has no upstream branch.