fix query to filter on effective location

[rhundal7]

• PR for issue Books Checked Out By Call Number should filter on effective location name #378
• Earlier I was setting the locationNames array to either get populated from the front end or set it to empty array and based my logic on that which was overcomplicated. I now changed it slightly. If the user selects all (more than allowed selections), in the frontend, it de-selects all selections, shows message to user. If the user still submits the form, it passes an empty array to backend, processes it (the scenario of everything) same like the scenario of nothing selected and returns the respective results. If the user selects some options, it passes that populated array to the backend and the respective where clause gets executed giving the result.

[wwtamu]

No need to get variables using the execution context, they are already available in the JavaScript scope.