check if element really exists before calling it. (e.g. for public shared files view, elements like "navigation" doesn't exist)

apps/files/js/files.js

@@ -195,6 +195,8 @@ $(document).ready(function() {
 			e.preventDefault(); // prevent browser from doing anything, if file isn't dropped in dropZone
 	});
 
+	if ( document.getElementById("file_upload_start") ) {
+	
 	$(function() {
 		$('.file_upload_start').fileupload({
 			dropZone: $('#content'), // restrict dropZone to content div
@@ -408,7 +410,8 @@ $(document).ready(function() {
 			}
 		})
 	});
-
+	}
+	
 	$.assocArraySize = function(obj) {
 		// http://stackoverflow.com/a/6700/11236
 		var size = 0, key;
@@ -592,7 +595,10 @@ $(document).ready(function() {
 
 	var lastWidth = 0;
 	var breadcrumbs = [];
-	var breadcrumbsWidth = $('#navigation').get(0).offsetWidth;
+	var breadcrumbsWidth = 0;
+	if ( document.getElementById("navigation") ) {
+		breadcrumbsWidth = $('#navigation').get(0).offsetWidth;
+	}
 	var hiddenBreadcrumbs = 0;
 
 	$.each($('.crumb'), function(index, breadcrumb) {