Update jquery.uls from upstream

Fixes two javascript error cases
Also fixes Bug 49382

Change-Id: I549d313f8bd570f89b2591491df97166dc999afc

lib/jquery.uls/src/jquery.uls.languagefilter.js

@@ -82,6 +82,10 @@
 						break;
 					}
 
+					// Avoid bubbling this 'enter' to background page elements
+					e.preventDefault();
+					e.stopPropagation();
+
 					query = $.trim( this.$element.val() ).toLowerCase();
 
 					if ( this.selectedLanguage ) {
@@ -243,6 +247,10 @@
 			this.selectedLanguage = langCode;
 			languageName = languageName || this.options.languages[langCode];
 
+			if ( !languageName ) {
+				return;
+			}
+
 			var autonym,
 				userInput = this.$element.val(),
 				suggestion = userInput + languageName.substring( userInput.length, languageName.length );

lib/jquery.uls/src/jquery.uls.lcd.js

@@ -205,7 +205,7 @@
 			}
 
 			if ( !this.options.quickList ) {
-				return;
+				return $( [] );
 			}
 
 			// Pick only the first elements, because we don't have room for more