From 12969de390dc01cb3a91905fa771a78044f95644 Mon Sep 17 00:00:00 2001
From: Bass Jobsen <bass@w3masters.nl>
Date: Mon, 19 Jan 2015 09:09:14 +0100
Subject: [PATCH] optional imports

should fix https://github.com/less/less.js/issues/2145
---
 lib/less/import-manager.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/less/import-manager.js b/lib/less/import-manager.js
index d70c1605..386320aa 100644
--- a/lib/less/import-manager.js
+++ b/lib/less/import-manager.js
@@ -40,12 +40,14 @@ module.exports = function(environment) {
             importManager.queue.splice(importManager.queue.indexOf(path), 1); // Remove the path from the queue
 
             var importedEqualsRoot = fullPath === importManager.rootFilename;
-
+            if (importOptions.optional && e) {
+			callback(null, {rules:[]}, false, null);		
+			}
+			else {
             importManager.files[fullPath] = root;
-
             if (e && !importManager.error) { importManager.error = e; }
-
             callback(e, root, importedEqualsRoot, fullPath);
+			}
         };
 
         var newFileInfo = {