Index: js/theme.js
===================================================================
--- js/theme.js	(revision 21499)
+++ js/theme.js	(working copy)
@@ -10,6 +10,11 @@
 		timeout = false;
 
 	$.fn.smallMenu = function() {
+		if ( ! masthead.find( '.menu' ).children().length ) {
+			$( '.menu-toggle' ).remove();
+			return;
+		}
+
 		masthead.find( '.site-navigation' ).removeClass( 'main-navigation' ).addClass( 'main-small-navigation' );
 		masthead.find( '.site-navigation h3' ).removeClass( 'assistive-text' ).addClass( 'menu-toggle' );