title: Python Pandas to_csv getting extra rows
body: <p>I'm using pandas to merge two csv files on top of each other that may have different column headers. Problem I'm having is it seems to be splitting to a new line randomly.</p>
  
  <pre><code>File 1:
  ID, Height
  0 , 1
  1 , 2
  2 , 3
  
  File 2:
  
  ID, Message
  0 , "Long string message"
  1 , "May include tabs, multiple lines \n
       that go on for a while"
  2 , "More of the same"
  </code></pre>
  
  <p>Result Should Be:</p>
  
  <pre><code>ID, Height, Message
  0,    1,     '',
  1,    2,     '',
  2,    3,     '',
  0,    '',    "Long string message",
  1,    '',    "May include tabs, multiple lines \n
                that go on for a while",
  2,    '',    "More of the same"
  </code></pre>
  
  <p>What I'm getting back is:</p>
  
  <pre><code>ID, Height, Message
  0,    1,     '',
  1,    2,     '',
  2,    3,     '',
  0,    '',    "Long string message",
  1,    '',    "May include tabs, multiple lines"
  "that go on for a while", '', '',
  2,    '',    "More of the same"
  </code></pre>
  
  <p>I'm getting it to work for the most part with the following:</p>
  
  <pre><code>first = pd.read_csv('file1.csv')
  second = pd.read_csv('file2.csv')
  
  merged = pd.concat([first, second], axis=0, ignore_index=True)
  merged.to_csv('test.csv')
  </code></pre>
  
  <p>Looks like if there is an extra line in the message field, it splits to a new line. How Can I stop it from delimiting based upon a new line in the message field?</p>