Nested data objects don't work when loading a table via a promise.

[dtychshenko]

When loading a data table through a promise, the .withDataProp() option does not seem to work with nested objects. For example:

Options:

vm.dtOptions = DTOptionsBuilder.fromFnPromise(function() {
        return $resource('data-nested.json').get().$promise;
    }).withDataProp('data.inner');

Data (data-nested.json):

{
    "data": {
        "inner": [
            {
                "id": 860,
                "firstName": "Superman",
                "lastName": "Yoda"
            }, {
                "id": 870,
                "firstName": "Foo",
                "lastName": "Whateveryournameis"
            }, {
                "id": 590,
                "firstName": "Toto",
                "lastName": "Titi"
            }
        ]
    }
}

Results in this error:

 TypeError: Cannot convert undefined or null to object
    at _doRender (angular-datatables.renderer.js:322)
    at angular-datatables.renderer.js:312
    at processQueue (angular.js:12984)
    at angular.js:13000
    at Scope.$get.Scope.$eval (angular.js:14200)
    at Scope.$get.Scope.$digest (angular.js:14016)
    at Scope.$get.Scope.$apply (angular.js:14304)
    at done (angular.js:9518)
    at completeRequest (angular.js:9703)
    at XMLHttpRequest.requestLoaded (angular.js:9646)

It seems the problem is in angular-datatables.renderer.js line 309:

// In case the data is nested in an object
if (renderer.options.sAjaxDataProp) {
    data = result[renderer.options.sAjaxDataProp];
}

I'll submit a pull request with a fix for this issue.

[l-lin]

Merged. 👍