Multi-page creates javascript error

This works like a charm except on multi-page webforms where some of the pages don't have conditionals.

Error: "d is null"

Steps to reproduce:

1) Create a webform with three fields
2) Insert a pagebreak between the first two
3) Make the third field conditional on the second
4) View the first "page" of the webform, and you'll notice jQuery is totally broken

I noticed the variables at the head of the document were giving a predictable value when viewing a page without conditionals. This helped with a simple fix:

$(document).ready(function() {
+  if (webform_conditional != null) {
	$.each(webform_conditional, function(dependentField, dependentInfo) {
			var formItemWrapper = webform_condtional_wrapper(dependentField,dependentInfo);
		
			formItemWrapper.css("display", "none");
			// Add onclick handler to Parent field
			webform_conditional_add_onchange(dependentField, dependentInfo);
		
	});
+ }

});