Administration: Fix undefined element JS error in pagination handler.

Follow up to [59727]. Handle cases where the `#current-page-selector` is not present on the page to prevent a JS warning.

Props tobiasbg, mamaduka, jorbin, joedolson. 
See #62534.

git-svn-id: https://develop.svn.wordpress.org/trunk@59746 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/js/_enqueues/admin/common.js

@@ -1310,16 +1310,12 @@ $( function() {
 		$document.trigger( 'wp-notice-added' );
 	};
 
-	// Stores initial pagination value for comparison.
-	var initialPagedValue = document.querySelector( '#current-page-selector' ).value;
-
 	$( '.bulkactions' ).parents( 'form' ).on( 'submit', function( event ) {
 		var form = this,
-			submitterName = event.originalEvent && event.originalEvent.submitter ? event.originalEvent.submitter.name : false;
-
-		var currentPagedValue = form.querySelector( '#current-page-selector' ).value;
+			submitterName = event.originalEvent && event.originalEvent.submitter ? event.originalEvent.submitter.name : false,
+			currentPageSelector = form.querySelector( '#current-page-selector' );
 
-		if ( initialPagedValue !== currentPagedValue ) {
+		if ( currentPageSelector && currentPageSelector.defaultValue !== currentPageSelector.value ) {
 			return; // Pagination form submission.
 		}