datePicker.bind() accepts a selector, but it isn't used

[litzinger]

Description of the problem
The date_picker.js file has a bind() function that accepts a variable named "elements", but it is unused:

ExpressionEngine/themes/ee/asset/javascript/src/cp/date_picker.js

Line 395 in f7ab28d

bind: function (elements) {

In various parts of the code, such as a few lines down from line 395, it passes a jQuery selector under the assumption that it is used, but it is not.

This should be refactored to be:

elements.on('focus', function() {

Or better yet:

if (!(elements instanceof jQuery)) {
    return;
}

elements.on('focus', function() {

[kevincupp]

Oops! Thanks for the catch. I'll copy and paste this over for you, but consider opening a PR if you know the fix.

[litzinger]

I thought about the PR, but I don't know if my change would have adverse side effects elsewhere, and I didn't have time to do thorough testing, so I just threw out there what looked like the fix would be.