title: git: 'credential-' is not a git command after installing SourceTree
body: <p>I use git right off the terminal on my Macbook.</p>
  
  <p>I recently install SourceTree as a GUI tool for git. But right after that, I realize SourceTree changed my local git repository configuration and my command git push, git pull or git fetch have it's behaviour changed.</p>
  
  <p>Now I get this output for those commands.</p>
  
  <pre><code>git: 'credential-' is not a git command. See 'git --help'.
  
  The most similar command is
      credential
  </code></pre>
  
  <p>Can anyone help me with that? My repo is hosted on GitHub and right after this strange output the command runs correctly.</p>