title: CSV Mongoimport throws bare " in non quoted fields
body: <p>I have a csv file which contains ["] if the value for that attribute is null. For example:</p>
  
  <pre><code>a,b,c
  1,2,3
  4,[""],6
  7,8,9
  </code></pre>
  
  <p>I have two RHEL systems with different Mongo versions: 2.4.1 and 3.4
  When I run this command: </p>
  
  <pre><code>time mongoimport --host hostname:27017 --db test --collection abc --file example.csv --type csv
  </code></pre>
  
  <p>This throws an error in version 3.4:</p>
  
  <pre><code> bare " in non-quoted-field
  </code></pre>
  
  <p>It works fine in 2.4.1 though!!! I need it to work on 3.4. Can anyone suggest a solution? the CSV files I have are huge and I dont want to alter the data.</p>