title: No submodule mapping found in .gitmodules for path
body: <p>When I run</p>
  
  <pre><code>git submodule update
  No submodule mapping found in .gitmodules for path 'Classes/lib/AFKissXMLRequestOperation'
  </code></pre>
  
  <p>But I have no submodule <code>Classes/lib/AFKissXMLRequestOperation</code> in current repos</p>
  
  <p>My git config is:</p>
  
  <pre><code>[core]
      repositoryformatversion = 0
      filemode = true
      bare = false
      logallrefupdates = true
      ignorecase = true
      precomposeunicode = false
  [remote "origin"]
      fetch = +refs/heads/*:refs/remotes/origin/*
      url = git@github.com:why_ios.git
  [branch "master"]
      remote = origin
      merge = refs/heads/master
  [submodule "External/ios-SDNestedTable"]
      url = git@github.com:why/ios-SDNestedTable.git
  [submodule "External/PSStackedView"]
      url = git@github.com:why/PSStackedView.git
  </code></pre>
  
  <p>and .gitmodules is:</p>
  
  <pre><code>[submodule "External/ios-SDNestedTable"]
      path = External/ios-SDNestedTable
      url = git@github.com:why/ios-SDNestedTable.git
  [submodule "External/PSStackedView"]
      path = External/PSStackedView
      url = git@github.com:why/PSStackedView.git
  </code></pre>