Fix two js error possibilities

Change-Id: I92ed487e7b5c70ef7851575eec676276e1ea905b

src/jquery.uls.languagefilter.js

@@ -243,6 +243,10 @@
 			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 );

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