Fix #1987. First, res may be null if we have an error with a URL. Second, if the URL has no protocol, use http

Author: lukeapage

lib/less/index.js

@@ -175,17 +175,23 @@ less.Parser.fileLoader = function (file, currentFileInfo, callback, env) {
         var urlStr = isUrl ? file : url.resolve(currentFileInfo.currentDirectory, file),
             urlObj = url.parse(urlStr);
 
+        if (!urlObj.protocol) {
+            urlObj.protocol = "http";
+            urlStr = urlObj.format();
+        }
+
         request.get({uri: urlStr, strictSSL: !env.insecure }, function (error, res, body) {
+            if (error) {
+                callback({ type: 'File', message: "resource '" + urlStr + "' gave this Error:\n  "+ error +"\n" });
+                return;
+            }
             if (res.statusCode === 404) {
                 callback({ type: 'File', message: "resource '" + urlStr + "' was not found\n" });
                 return;
             }
             if (!body) {
                 console.error( 'Warning: Empty body (HTTP '+ res.statusCode + ') returned by "' + urlStr +'"' );
             }
-            if (error) {
-                callback({ type: 'File', message: "resource '" + urlStr + "' gave this Error:\n  "+ error +"\n" });
-            }
             pathname = urlStr;
             dirname = urlObj.protocol +'//'+ urlObj.host + urlObj.pathname.replace(/[^\/]*$/, '');
             handleDataAndCallCallback(body);