search date range failed

[EruditePig]

Short description
w2ui.myGrid.search records between dates fail

What is current behavior

http://jsfiddle.net/EruditePig/vd1jhcn0/23/

1. click Draw Grid Btn
2. click Click me Btn, expect record1 should remain in grid, but now all records gone

What is desired behavior
...

Link to jsfidle/codepan with sample code

https://jsfiddle.net/EruditePig/mr5h13kg/17/

i modify the search function in w2ui.js，in the jsfidle above, the w2ui js is linked to my github fork repo.

what i modify is add check if there is 'operator' defined in search data, if any , use the user defined operator

search: function()
...
                    if (!'operator' in data){  // I add this if
                        if (typeof data.value == 'number') data.operator = 'is';
                        if (typeof data.value == 'string') data.operator = this.textSearch;
                        if ($.isArray(data.value)) data.operator = 'in'
                    }

Steps to reproduce or sample
...