title: jqgrid ie8 multiple search filter not picking search data when using cmTemplate
body: <p>using ie8, jqgrid 4.3.3, jquery 1.7.2 or 1.5.2, multiple search seems to miss some search parameters. 
  on adding a new search row for the 1st time, it appears in the request body but with a blank value ("")
  such as. </p>
  
  <pre><code>"filters":"{\"groupOp\":\"AND\",\"rules\":[{\"field\":\"code\",\"op\":\"eq\",\"data\":\"\"}]}", 
  </code></pre>
  
  <p>subsequent search with the same parameters sends the correct vlaue.
  My basic setup is as follows (simplified)</p>
  
  <pre><code>$('#Table').jqGrid({
           //....
      datatype: 'json',
      colNames: ['Code'],
      colModel: [{
          name: 'Code',
          index: 'Code'}],
      pager: '#Pager'
  }).jqGrid('navGrid', '#Pager', {
      add: false,
      edit: false,
      del: false,
      refresh: false
  }, {}, {}, {}, {
      multipleSearch: true
  }).trigger('reloadGrid');
  </code></pre>
  
  <p><strong>UPDATED:</strong> added <a href="http://jsfiddle.net/pwachira/CH5rZ" rel="nofollow">jsfiddle</a></p>
  
  <p>after a long time, I found that the error happens only if I am using cmTemplate to specify searchoptions sopt and when I click on 'find' without 1st clicking outside the data text box. 
  <a href="http://jsfiddle.net/pwachira/CH5rZ" rel="nofollow">See jsfiddle here</a> (remember to click the find button directly after typing the search value)</p>