First of all DONT USE JQUERY WITH ANGULAR, instead  angular controller to manipulate the logic.
This can be done in few ways, here is one of them.
If you have a field with id 4c609cf1bbb6c5080865df9cfc1fb649_mylogs_details_customer then use ng-model on it.
Example using ng-model:
<input type="text" id="4c609cf1bbb6c5080865df9cfc1fb649_mylogs_details_customer" ng-model="customer_details">
Controller:
app.controller('myCtrl', function($scope) {
    $scope.openlogsEservModal = function(param1,param2,param3,param4)
    {
        if ($scope.customer_details; == '') {
            // return false / Do nothing;
        }
        else
        {
         // write your logic here
        }
    }
});
If it is dynamic and if you cannot use ng-model,
In the method, openlogsEservModal check the condition you want to check using angular.element and do your logic.
Here is the controller, you can use like this,
Example without using ng-model::**
app.controller('myCtrl', function($scope) {
    $scope.openlogsEservModal = function(param1,param2,param3,param4)
    {
     var customer = angular.element('#4c609cf1bbb6c5080865df9cfc1fb649_mylogs_details_customer').val();
        if (customer == '') {
            // return false / Do nothing;
        }
        else
        {
         // write your logic here
        }
    }
});