Log the context of the ULS in which no search results were found

Relies on updates to EventLogging schema. Diff:
https://meta.wikimedia.org/w/index.php?title=Schema%3AUniversalLanguageSelector&type=revision&diff=17799034&oldid=7327441

Bug: T179402
Change-Id: I2ff9ce9b40df16ed3c5e6970fb3b691af08cedec

resources/js/ext.uls.eventlogger.js

@@ -237,13 +237,16 @@
 		/**
 		 * Log search strings which produce no search results.
 		 *
-		 * @param {jQuery.event} event The orignal event
+		 * @param {jQuery.event} event The original event
 		 * @param {string} context The query string
+		 * @param {string} ulsPurpose The ulsPurpose option of the ULS panel that triggered the event
 		 */
-		noSearchResults: function ( event, context ) {
+		noSearchResults: function ( event, context, ulsPurpose ) {
 			this.log( {
 				action: 'no-search-results',
-				context: context
+				context: context,
+				ulsPurpose: ulsPurpose,
+				title: mw.config.get( 'wgPageName' )
 			} );
 		}
 	};