title: Use git rebase and I get 'Nothing to do'
body: <p>Same as title
  I type "git rebase -i [commit_id]", and I got this:</p>
  
  <pre><code>Error detected while processing /Users/My_name/.vimrc:
  line    1:
  E117: Unknown function: pathogen#infect
  E15: Invalid expression: pathogen#infect()
  Press ENTER or type command to continue
  </code></pre>
  
  <p>after type enter, I success to enter the vim editor.</p>
  
  <pre><code>  1 pick f694d12 test
    2
    3 # Rebase 3dad5af..f694d12 onto 3dad5af (1 command(s))
    4 #
    5 # Commands:
    6 # p, pick = use commit
    7 # r, reword = use commit, but edit the commit message
    8 # e, edit = use commit, but stop for amending
    9 # s, squash = use commit, but meld into previous commit
   10 # f, fixup = like "squash", but discard this commit's log message
   11 # x, exec = run command (the rest of the line) using shell
   12 # d, drop = remove commit
   13 #
   14 # These lines can be re-ordered; they are executed from top to bottom.
   15 #
   16 # If you remove a line here THAT COMMIT WILL BE LOST.
   17 #
   18 # However, if you remove everything, the rebase will be aborted.
   19 #
   20 # Note that empty commits are commented out
  </code></pre>
  
  <p>I delete the line 1 "pick f694d12 test" and save it, I just got a report</p>
  
  <pre><code>Nothing to do
  </code></pre>
  
  <p>How can I fix it?</p>